Health Calculator by Age and Weight — Why the Same Numbers Mean Different Things for Women After 40

By Ajay Kumar, Women’s Health Researcher | EverGreenHealthToday.com Fact-checked against PMC, NIH, Mifflin-St Jeor Research, Oxford Nutrition Reviews 2025 | Last Updated: March 2026

A health calculator by age and weight seems straightforward — enter your numbers, get your result. But for women between 35 and 55, the output of almost every standard health calculator changes meaning significantly as age increases and hormonal status shifts. The BMI calculation that showed a healthy weight at 38 may be hiding dangerous visceral fat accumulation at 46 from the same body weight. The calorie maintenance number that was accurate at 40 may be overestimating actual maintenance by 200–300 calories at 48 after estrogen-driven metabolic rate reduction.

The protein recommendation that was sufficient at 35 may be approximately half what is needed at 45 for muscle preservation and fullness hormone activation. Using health calculators that use age and weight as inputs but not hormonal status as a variable produces a systematic gap between what the calculator tells you and what your body is actually doing — and this gap grows progressively wider through the perimenopause years. This guide explains exactly how age changes the interpretation of every major health calculation, which calculations require the most significant adjustments after 40, and how to use free online tools that account for these differences.

👉 Access free health calculators by age and weight for women — evergreenhealthtoday.com/health-tools/

Quick Answer — How Age and Weight Calculations Change After 40

Key adjustments required in standard health calculations by age:

• BMR by age and weight: Decreases approximately 10 calories per year from muscle loss alone — plus an additional 250–300 cal/day reduction from estrogen decline in perimenopause
• TDEE by age: The same activity level produces fewer total calories burned as metabolic efficiency declines — recalculation required every 2–3 years
• Ideal weight by age and weight: Healthy weight ranges shift slightly upward with age as body composition goals change from “lower weight” to “preserved muscle mass”
• BMI by age: Identical BMI values carry different risk profiles at 45 vs 30 because fat distribution changes independently of total weight
• Protein by age: Requirement increases from 0.36g/lb (RDA) to 0.8–1.0g/lb after 40 due to estrogen-driven protein catabolism and GLP-1 activation needs
• Calorie deficit by age: Safe maximum deficit decreases from 500–700 cal/day at 30 to 300–400 cal/day at 45 because cortisol reactivity increases with estrogen decline

Full guide: Health Calculator by Age and Weight — Why Numbers Change After 40

Why Age Changes What Your Weight Actually Means

The Same Weight at 35 and 45 Is Not the Same Body

This is the most important and most counterintuitive insight in women’s health after 40: the same body weight at different ages can represent completely different body compositions, risk profiles, and health statuses.

A 150-lb woman at 35 typically has:

• Approximately 26–28% body fat
• Fat distributed toward hips, thighs, and gluteal region
• Estrogen actively directing fat storage away from the visceral abdominal depot
• Functional GLP-1 fullness hormone sensitivity
• Good insulin receptor sensitivity
• BMR approximately 1,450–1,500 calories

The same 150-lb woman at 47 may have:

• Approximately 33–36% body fat (muscle loss + fat gain despite same scale weight)
• Fat redistributed toward the visceral abdominal depot from estrogen decline
• Higher visceral fat area despite identical BMI
• Reduced GLP-1 sensitivity from estrogen fluctuation
• Reduced insulin sensitivity
• BMR approximately 1,200–1,250 calories

Both women enter the same numbers into a standard BMI calculator by age and weight and receive the same “normal weight” output. Their metabolic risk profiles are dramatically different. Their dietary needs are dramatically different. Their health trajectories without intervention are dramatically different.

This is why health calculations by age and weight — not just by weight alone — matter enormously for women in the 35–55 age window.

Key Signs Your Current Health Calculations Need Updating

These patterns suggest your health calculator results are no longer accurately reflecting your current biology:

Signs your TDEE calculation is outdated:

• Eating at your calculated maintenance is producing slow weight gain
• A caloric deficit that previously produced steady weight loss now produces plateau
• You feel the same hunger at calculated maintenance as you did at calculated deficit
• Weight loss requires eating 200–300 calories less than the calculator suggests

Signs your BMI calculation is misleading you:

• Normal BMI but waist circumference above 35 inches
• Normal BMI but belly fat visibly accumulating without dietary change
• Normal BMI but blood glucose, cholesterol, or blood pressure elevating
• Normal BMI but clothing fitting differently at the waist despite no scale change

Signs your protein calculation is insufficient:

• Persistent hunger despite eating at calculated caloric target
• Muscle soreness lasting more than 48 hours after exercise
• Progressive loss of muscle tone despite maintaining weight
• Energy crashes between meals

Signs your calorie deficit calculation is causing harm:

• Belly fat specifically not responding to deficit that produces weight loss elsewhere
• Increased anxiety and poor sleep accompanying dietary restriction
• Strong cravings for sugar and carbohydrates on restricted days
• Plateau after initial weight loss followed by belly fat accumulation

Main Causes — Why Health Calculations Change With Age

Estrogen Decline Changes Metabolic Rate Calculations

Estrogen supports resting metabolic rate through four independent mechanisms: insulin sensitivity maintenance (directing glucose to muscle rather than fat storage), muscle mass preservation (reducing the catabolism that lowers BMR), GLP-1 L-cell sensitivity (reducing the hunger-driven caloric intake that must be offset by higher BMR estimates), and thyroid hormone T4-to-T3 conversion efficiency (supporting the thyroid’s contribution to cellular metabolic rate).

Standard BMR formulas — including the most accurate validated formula, Mifflin-St Jeor — do not include an estrogen status variable. They cannot distinguish between a 44-year-old woman in early perimenopause with estrogen fluctuating but relatively intact and a 48-year-old woman in late perimenopause with consistently low estrogen. Both receive the same BMR output for identical height, weight, and age inputs.

Research consistently shows that the energy expenditure reduction during the menopausal transition exceeds what age alone predicts — confirming that hormonal status, not just chronological age, determines metabolic rate.

Muscle Loss Changes the Weight-to-Metabolism Ratio

Skeletal muscle is the primary metabolically active tissue in the body. Each pound of muscle burns approximately 6 calories per day at rest. Muscle loss begins around age 30 (sarcopenia) at approximately 0.5–1% per year, accelerating to 1–2% per year from the mid-40s as estrogen decline removes its muscle-preserving signal.

A woman who loses 10 lbs of muscle over a decade has a resting metabolic rate 60 calories per day lower than standard health calculators by age and weight predict for her current measurements — because the formulas assume average muscle mass for her weight, not her actual reduced muscle mass.

This systematic underestimation of BMR reduction worsens every downstream calculation: TDEE is overestimated, deficit appears larger than it is, and protein requirements are underestimated precisely when they are most critical to address the muscle loss driving the metabolic change.

Fat Redistribution Changes BMI Interpretation

As estrogen declines, alpha-2 adrenergic receptors in lower-body subcutaneous fat lose the estrogen-driven signal that directed fat storage to hips and thighs. Cortisol’s competing signal — directing fat to the visceral abdominal depot through glucocorticoid receptors that are most dense in visceral fat — gains relative dominance.

This redistribution changes everything about what the health calculator by age and weight output means. At the same BMI, the 46-year-old woman with perimenopause-driven visceral fat redistribution carries significantly higher cardiovascular risk, insulin resistance, and metabolic syndrome risk than the same BMI at 36 — because the risk is from visceral fat, not from total weight.

Insulin Resistance Increases Post-Meal Fat Storage Efficiency

Estrogen supports insulin receptor sensitivity in peripheral tissues. Estrogen decline increases peripheral insulin resistance — blood glucose rises higher after meals, insulin releases more forcefully to compensate, and visceral fat’s dense insulin receptors receive a stronger fat-storage signal per meal.

Standard macro calculators that specify carbohydrate intake do not adjust for age-related insulin resistance. The same carbohydrate quantity that was efficiently stored as muscle glycogen at 35 drives more fat storage at 47 — meaning the carbohydrate portion of a calculated macro split requires quality adjustment with age even when quantity remains the same.

The Science of Age-Adjusted Health Calculations

The foundational science of why health calculations change with age — beyond simple age-related metabolic rate decline — is the biology of adipose tissue receptor density and hormonal signaling.

Visceral adipose tissue is not passive storage. It is metabolically active, producing inflammatory cytokines, responding to cortisol and insulin, and operating through a distinct hormonal receptor profile from subcutaneous fat. Visceral fat has higher glucocorticoid receptor density (more cortisol sensitivity), higher insulin receptor density (more insulin-driven fat storage), and higher androgen receptor density than subcutaneous fat elsewhere on the body.

As estrogen declines with age, the balance between the lower-body subcutaneous fat routing signal (estrogen-mediated) and the visceral fat storage signal (cortisol-mediated) shifts toward visceral accumulation. This shift is not captured by any calculation based only on height, weight, and age — because it reflects receptor-level hormonal biology that these measurements do not contain.

The practical implication: a health calculator by age and weight that does not also incorporate hormonal status indicators — perimenopause stage, cycle regularity, cortisol symptoms, GLP-1 function — is working from systematically incomplete inputs for women over 40.

What the Research Confirms About Age-Adjusted Calculations

Study 1 — Energy Expenditure Across the Menopausal Transition

A longitudinal study published in Menopause measured total energy expenditure in women before, during, and after the menopausal transition using doubly labeled water — the gold standard measurement method. Researchers found that total energy expenditure decreased by an average of 131 calories per day during the menopausal transition compared to premenopausal baseline, even after controlling for changes in physical activity and body weight. The study confirmed that standard age-based calorie calculators systematically overestimate energy expenditure for women in and after the menopausal transition — supporting the need for hormonal-status-adjusted calculations rather than age-and-weight-only inputs.

Study 2 — BMI, Visceral Fat, and Metabolic Risk in Perimenopausal Women

A study published in Obesity examined the relationship between BMI, visceral fat area (measured by CT imaging), and metabolic risk markers in women before, during, and after the menopausal transition. The study found that visceral fat area was a significantly stronger predictor of insulin resistance, elevated triglycerides, and metabolic syndrome than BMI at all menopausal stages — and that the relationship between BMI and visceral fat changed substantially across the transition. Women in late perimenopause showed significantly higher visceral fat area for the same BMI value than premenopausal women, confirming that the same health calculator by age and weight output carries a different metabolic risk meaning depending on menopausal status.

Health Risks of Using Age-Unadjusted Health Calculations

Using health calculations that do not account for the specific changes occurring after 40 creates concrete, measurable health risks:

Cardiovascular risk underestimation. A woman using a BMI-only health assessment at normal BMI but with perimenopause-driven visceral fat accumulation above 35 inches waist circumference has unrecognized abdominal obesity — with its associated elevated triglycerides, inflammatory cytokines, and atherosclerosis risk. Without waist circumference or body composition assessment alongside BMI-by-age-and-weight, this risk is systematically invisible.

Metabolic syndrome development. The combination of visceral fat accumulation, insulin resistance, and cortisol elevation that standard health calculators do not capture is exactly the cluster that defines metabolic syndrome. Women who manage their health using only BMI-by-weight calculations miss the early warning signals that appear in waist circumference, body composition, and hormonal markers before metabolic syndrome becomes clinically diagnosable.

Dietary strategy failure. Using a TDEE by age and weight that overestimates maintenance by 200–300 calories produces a systematic daily caloric surplus that explains 2–3 lbs of annual weight gain without any behavioral change. Over 5 years, this represents 10–15 lbs of weight gain attributable entirely to calculation error rather than dietary failure — with profound implications for both physical health and psychological relationship to food and dieting.

Protein deficiency and accelerated muscle loss. Standard protein calculators by age and weight recommend the RDA of 0.36g per pound. For a 150-lb perimenopausal woman, this is 54g of protein daily — approximately half the 120–150g that research supports for muscle preservation and GLP-1 fullness hormone activation. Chronically under-consuming protein under the belief that the calculator’s recommendation is correct accelerates the muscle loss and metabolic rate decline that makes weight management progressively harder each year.

Natural Solutions — How to Use Age-Adjusted Calculations Effectively

Solution 1 — Recalculate Every Year After 40

The standard recommendation is to recalculate TDEE and BMR once when beginning a dietary program and then apply the resulting number indefinitely. This approach is appropriate when hormonal status is stable. For women in perimenopause — where estrogen levels are changing year to year, sometimes significantly — annual recalculation captures the metabolic rate changes that are occurring continuously.

A woman who calculates her TDEE at 43 using accurate inputs and then uses that number at 47 without recalculation may be using a maintenance estimate that is 300–400 calories too high — the accumulated effect of 4 years of estrogen-driven metabolic rate decline.

👉 Recalculate your TDEE annually — free TDEE Calculator

Solution 2 — Add Waist Circumference to Every Health Assessment

Every health calculation by age and weight should be paired with a waist circumference measurement — because waist circumference captures the visceral fat redistribution that weight and BMI cannot detect.

The clinical threshold: waist circumference above 35 inches (88 cm) in women indicates abdominal obesity and independently predicts elevated cardiovascular and metabolic risk, regardless of BMI category.

Monthly waist circumference tracking — measured at the navel level, morning, without holding breath — provides the single most important metric that standard health calculators by age and weight systematically miss.

👉 Check your Waist-to-Hip Ratio — free calculator

Solution 3 — Use Body Composition Alongside BMI

Body composition measurement — fat mass versus lean mass — addresses the fat-for-muscle exchange that occurs during the menopausal transition without changing scale weight or BMI. A woman who gains 5 lbs of visceral fat and loses 5 lbs of muscle shows no change on BMI-by-weight calculations but has dramatically worsened body composition and metabolic health.

The body fat percentage calculator combined with waist circumference measurement provides the two-dimensional health picture that weight and BMI alone cannot.

👉 Calculate your body fat percentage — free Body Fat Calculator

Solution 4 — Apply Phase-Specific Calorie Calculations

For women who still have menstrual cycles — even irregular ones in perimenopause — calorie calculations by age and weight applied as flat daily targets ignore the documented 100–300 calorie difference in daily needs between the follicular and luteal phases. The Oxford 2025 meta-analysis confirms this difference is biologically driven, not behavioral.

Using cycle-aware calorie calculations produces both better hormonal management and better fat loss adherence than flat daily targets that fight luteal phase biology for 14 days each month.

👉 Get phase-specific calorie targets — free Cycle-Synced TDEE Calculator

Solution 5 — Upgrade Your Protein Calculation

The most commonly underestimated number in health calculations for women over 40 is the protein target. Standard protein calculators by age and weight apply the RDA (0.36g per pound) — designed for weight maintenance in sedentary adults, not for perimenopausal muscle preservation and GLP-1 activation.

Evidence-based protein target for women over 40: 0.8–1.0g per pound of bodyweight daily. For a 150-lb woman, this is 120–150g — more than double the 54g that standard protein calculators by age and weight recommend.

👉 Calculate your age-appropriate protein target — free Protein Calculator

Best Foods That Work With Age-Adjusted Health Calculations

Food	Why It Supports Age-Adjusted Health Goals
Plain probiotic Greek yogurt	17–20g protein per serving — most efficient food source for hitting higher protein targets; GLP-1 L-cell activation
Eggs	Complete protein with all essential amino acids; yolk fat activates GPR119 GLP-1 receptor; choline supports liver fat metabolism
Wild-caught salmon	EPA+DHA support the insulin sensitivity that estrogen decline impairs; complete protein for muscle preservation
Lentils	18g protein + 16g fiber per cup — supports both protein target and fiber intake for SCFA-GLP-1 activation
Oats (rolled)	Beta-glucan fiber activates TGR5 GLP-1 receptors; stabilizes blood glucose for insulin resistance support
Pumpkin seeds	156mg magnesium per oz — supports HPA axis cortisol modulation; zinc supports insulin receptor sensitivity
Cruciferous vegetables	DIM supports healthy estrogen metabolism; fiber supports gut microbiome GLP-1 production
Avocado	Monounsaturated fat activates GPR119 fat receptor GLP-1; supports sex hormone production
Ground flaxseed	Lignans modulate estrogen receptor activity; ALA omega-3 GPR119 activation; soluble fiber SCFA production
Berries	Flavonoid GLP-1 activation pathway; lowest glycemic load in fruit category for insulin resistance management

Foods That Undermine Age-Adjusted Health Calculations

Refined sugars and white flour products — Drive post-meal glucose spikes that are significantly larger in perimenopausal women due to estrogen-decline-related insulin resistance. The same carbohydrate load produces more visceral fat storage at 47 than at 37 through the intensified insulin-visceral receptor signal.

Alcohol — Impairs thyroid T4-to-T3 conversion (worsening the metabolic rate reduction already occurring from estrogen decline), disrupts slow-wave sleep (cortisol clearance window), and acutely reduces GLP-1 by approximately 34%. The caloric and hormonal impact of alcohol is significantly greater for the perimenopausal metabolic environment than for younger metabolisms.

Ultra-processed food — Disrupts the gut microbiome that supports SCFA production for GLP-1 activation. When GLP-1 is already declining from estrogen loss, the additional suppression from gut dysbiosis compounds the hunger-amplification that is already making calorie calculations harder to adhere to.

Skipping meals — Creates the blood glucose valleys that trigger cortisol-mediated gluconeogenesis — extending cortisol elevation beyond the morning peak and activating visceral glucocorticoid receptors throughout the day. For women with perimenopause-driven reduced cortisol buffering, meal skipping produces a larger cortisol response and a stronger visceral fat activation signal than it did at 30.

Expert Tips for Using Health Calculations by Age and Weight

Always pair BMI with waist circumference. A BMI of 24 and a waist of 36 inches represents abdominal obesity and elevated cardiometabolic risk — regardless of what the BMI category says. Never use BMI by age and weight as your sole health metric after 40.

Use your perimenopause stage to contextualize your TDEE. Early perimenopause (cycle variability beginning) typically involves intermittent rather than consistent metabolic rate reduction. Late perimenopause (60+ day cycle gaps) involves consistent, maximal metabolic rate reduction from chronically low estrogen. Identifying your stage with the Perimenopause Stage Finder tool before recalculating TDEE produces a more accurate calorie target than age and weight alone.

Set protein as a non-negotiable floor, not a flexible target. Most women treat protein as one element in a macro split — to be reduced when total calories need to drop. For women over 40, protein should be the fixed floor around which everything else adjusts. When calories need to drop, reduce fat and carbohydrate quantities while maintaining the 0.8–1.0g/lb protein target. Protein drives GLP-1 activation, muscle preservation, and thermic food effect — the three mechanisms most impaired by estrogen decline.

Track trends, not single data points. A single day’s calorie consumption or a single week’s weight measurement reflects normal physiological variation rather than meaningful trends. Monthly averages of weight, weekly averages of calorie intake, and monthly waist circumference measurements provide the trend data that health calculations by age and weight are designed to inform.

Recalculate after significant hormonal changes. Beginning or ending hormone replacement therapy, entering a new perimenopause stage (identified by cycle pattern changes), or experiencing significant weight change (10+ lbs) all warrant immediate recalculation of TDEE, BMR, protein target, and safe deficit. These are not minor calculation refinements — hormonal status changes can shift TDEE by 200–400 calories, making the previous calculation significantly inaccurate.

(Full perimenopause metabolic guide: The 4 Stages of Perimenopause — What Each Stage Does to Your Weight)

Frequently Asked Questions

Q: What is the most accurate health calculator by age and weight for women over 40? The Mifflin-St Jeor equation is the most validated BMR formula for most adults and provides the most accurate starting point for TDEE calculations by age and weight. However, for women in perimenopause, the formula systematically overestimates BMR by 100–300 calories per day because it does not include hormonal status. The most accurate approach is to use the Mifflin-St Jeor-based TDEE Calculator and then apply a perimenopause adjustment: reduce the calculated TDEE by 5–10% if you are in early perimenopause, and 10–15% if you are in late perimenopause or postmenopause. This produces a significantly more accurate maintenance estimate than age and weight alone.

Q: How does age affect my ideal weight calculation? Standard ideal weight formulas — Hamwi, Devine, Robinson, Miller — were derived from insurance and clinical data that did not account for age-related body composition changes. A 45-year-old woman at the same weight as her 30-year-old self has more fat and less muscle — but the formula does not know this. More importantly, the goal of “ideal weight” shifts with age from achieving a lower number to preserving muscle mass at a weight that maintains metabolic health. The Ideal Weight Calculator at EverGreenHealthToday uses multiple formulas to show a range rather than a single number, acknowledging the individual variation that increases with age.

Q: Do I really need a different calorie calculator after 40? The formula itself does not change — Mifflin-St Jeor remains the best validated equation. What changes is the need for more frequent recalculation and the addition of hormonal context. A woman who calculates once at 40 and uses that number until 50 without recalculation will be using an estimate that is progressively less accurate each year. By age 50, without perimenopause adjustment, the error may be 300–400 calories per day — equivalent to the difference between weight maintenance and gaining 25–35 lbs per decade from calculation error alone.

Q: Should the protein calculator give different results by age? Yes — and significantly. The RDA of 0.36g per pound of bodyweight applies to healthy adults for disease prevention and general function. For women over 40 with estrogen-driven protein catabolism, reduced GLP-1 L-cell sensitivity that protein activates, and active risk of muscle loss lowering metabolic rate, research supports 0.8–1.0g per pound daily. The Protein Calculator at EverGreenHealthToday uses this evidence-based range rather than the standard RDA, producing a target that typically doubles what other protein calculators recommend — and that more accurately reflects what the research supports for women over 40.

Q: Can a health calculator by age and weight replace a doctor’s assessment? No — and it is not designed to. Health calculators by age and weight provide a quantitative starting framework for self-monitoring and lifestyle planning. They cannot replace comprehensive blood panels (fasting insulin, HOMA-IR, free T3, estradiol, FSH, complete metabolic panel), clinical assessment of body composition by DEXA scan or clinical measurement, or individualized medical guidance. They are most valuable as consistent tracking tools — identifying trends over time — and as a framework for understanding the numbers your healthcare provider gives you.

Q: What is the difference between BMR and TDEE in age-adjusted calculations? BMR (Basal Metabolic Rate) is the calories your body burns at complete rest — just to maintain heartbeat, breathing, and organ function. It is calculated primarily from age, weight, height, and sex. TDEE (Total Daily Energy Expenditure) is BMR multiplied by an activity factor — it represents your actual daily caloric need including movement and exercise. BMR is your absolute floor — never eat below it. TDEE is your maintenance level. Both decline with age, and both require the hormonal-status adjustments described in this article for accuracy after 40. Begin every dietary calculation by calculating BMR first, then TDEE, then deficit — in that sequence.

Conclusion — Use Numbers That Match Your Actual Biology

Health calculations by age and weight are among the most useful tools available for women managing their metabolic health — when the calculations are accurate. For women over 40, accuracy requires acknowledging that age and weight are necessary but insufficient inputs: hormonal status, perimenopause stage, muscle mass, and fat distribution are equally important variables that standard formulas omit.

The practical steps are clear: recalculate TDEE annually using your current age and weight, add waist circumference measurement to every BMI assessment, use the protein calculator at the evidence-based 0.8–1.0g/lb range rather than the standard RDA, apply cycle-synced calorie targets if your cycle is still present, and interpret every calculation in the context of your current hormonal environment.

The free health calculators for women over 40 at EverGreenHealthToday.com were built with these adjustments — producing outputs that reflect the actual metabolic biology of women in their 30s, 40s, and 50s rather than the average-adult formulas that systematically underserve this population.

Your Action Plan

• ✅ Recalculate your TDEE and BMR with your current age and weight today
• ✅ Measure your waist circumference alongside your next scale weigh-in
• ✅ Recalculate your protein target at 0.8–1.0g per pound of bodyweight
• ✅ Find your perimenopause stage and apply the appropriate TDEE adjustment
• ✅ Begin monthly waist circumference tracking alongside weekly scale averages
• ✅ Set a calendar reminder to recalculate all numbers in 6 months

Free Health Calculators by Age and Weight — All Tools

👉 TDEE Calculator — recalculate at current age and weight 👉 BMR Calculator — your metabolic floor by age and weight 👉 BMI Calculator — BMI by age and weight with context 👉 Body Fat Calculator — composition beyond scale weight 👉 Ideal Weight Calculator — range by age, height, and frame 👉 Protein Calculator — evidence-based target for women over 40 👉 Waist-to-Hip Ratio — fat distribution beyond BMI 👉 Perimenopause Stage Finder — hormonal context for all your calculations 👉 Cycle-Synced TDEE Calculator — phase-specific calorie targets 👉 Hormonal Belly Fat Risk Tool — risk beyond BMI

Research Sources: • PMC — Visceral Fat Area Is a Stronger Predictor Than BMI of Metabolic Risk in Perimenopausal Women (PMC3606788) • Menopause Journal — Total Energy Expenditure Decreases During Menopausal Transition: Doubly Labeled Water Measurement • Oxford Nutrition Reviews — Luteal Phase Energy Intake +168 kcal/day vs Follicular: Meta-Analysis 2025 • PMC — Mifflin-St Jeor Equation: Validation and Accuracy Across Populations (PMC6933416) • NIH — Dietary Reference Intakes: Protein and Amino Acids for Women at Different Life Stages