Evidence-based nutrition

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The Definitive Guide

The complete evidence guide to exercise and body composition

The three variables marketed hardest in fitness — exercise type, weight load, and workout intensity — were each tested independently by different research teams across different decades. This guide holds all nine analyses together for the first time, including the tensions between them and the one question nobody can answer yet.

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Cardio is better than weights for fat loss
You need to lift heavy to build muscle
HIIT burns significantly more fat (afterburn effect)
Women will get bulky from lifting weights
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What the evidence says
Do You Need Heavy Weights to Build Muscle? Your muscles cannot tell how much weight you are holding. They only know how hard they are working. When you push a set to the absolute limit —… 3:06 · 3 studies
Will Lifting Weights Make You Bulky? 29 Studies Measured the Difference Your muscles grow at the same percentage rate as a man's. The meta-analysis measured 0.69% difference across 29 studies — with a 26% chance women actually grow faster.… 2:47 · 2 studies
HIIT for Fat Loss: 29 Trials Measured the Afterburn at 5 Grams Per Day If you do HIIT instead of regular cardio, you will lose essentially the same amount of fat. The tiny extra fat loss HIIT provides — about the weight… 2:58 · 2 studies
The Best Exercise for Fat Loss Doesn’t Exist — Here’s What 65 Trials Actually Reveal Your body does not care whether you run, lift, or do both — it cares how hard you work and how much you eat. Three large bodies of… 2:50 · 6 studies
Cardio vs Weights for Fat Loss — 36 Trials, One Surprising Answer Your body doesn't care whether you run, lift, or do both — it cares how hard you work. The tiny fat-loss advantage cardio has over weights comes from… 3:07 · 3 studies
Does Cardio Kill Your Gains? What 43 Studies Found Your body does not have to choose between getting stronger and getting fitter through cardio. Forty-three studies put people through both types of training and measured the results… 3:15 · 3 studies
How Many Sets Per Week Do You Need to Build Muscle? Your muscles grow more when you train them more — but only up to a point. The first ten or so weekly sets per muscle earn full returns,… 3:14
The Exercise Advice Women Over 40 Keep Getting Is Solving the Wrong Problem Your body responds to exercise the same way a man's does — your muscles grow at the same percentage rate, and whether you run, lift, or do both… 3:26
Why Isn’t All This Exercise Making Me Lose Weight? Your body has a daily calorie budget that stays roughly the same whether you exercise moderately or intensely. Burn more through movement and your body quietly cuts spending… 3:40 · 3 studies
The papers we actually read
Your Training App Counts Sets Wrong. 67 Studies Prove It. A 67-study meta-analysis found that counting indirect sets as half a direct set — the fractional method — predicted muscle… Pelland et al. · 2025 · Sports Medicine · n=67
The Afterburn Effect Is Real — and It Doesn’t Matter The afterburn advantage is statistically real but clinically trivial — less than half a percent of body fat, roughly 5… al. et al. · 2023 · International Journal of Environmental Research and Public Health · n=807
The Interference Effect, Tested in 43 Studies Combining cardio and strength training has no meaningful effect on muscle growth — the difference across 43 studies and 1,090… Schumann et al. · 2022 · Sports Medicine · n=1,090
Women Build Muscle at the Same Rate. So Why the Fear? Women and men build muscle at virtually the same relative rate. The 0.69% difference across 29 studies is too small… Refalo et al. · 2025 · PeerJ · n=2,815
Do You Need Heavy Weights to Build Muscle? 21 Studies Muscle growth was statistically identical between light and heavy weights when sets were taken to the point of complete muscular… Schoenfeld et al. · 2017 · Journal of Strength and Conditioning Research
Cardio vs. Weights: The 1 kg Gap Nobody Mentions The fat loss difference between cardio and weights is approximately 1 kg across 36 studies. When total work is equalized,… Lafontant et al. · 2025 · Journal of the International Society of Sports Nutrition · n=1,564
The Constrained Energy Model: More Exercise Won’t Burn More Above a moderate activity level, your body's total daily calorie burn plateaus — additional exercise gets metabolically absorbed rather than… Pontzer et al. · 2016 · Current Biology · n=332
Science in two minutes
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Training

Researchers tested frequency, type, intensity, age, and training status. Not one of them found a cardio ceiling for muscle growth.

How Much Cardio Can You Do and Still Build Muscle?
3 min read 618 words
training

Strength is calibrated to whatever you practice.

Free Weights Activate More Muscles. The Growth Is Identical.
2 min read 529 words
Muscle & Strength

Age, when training was present, was irrelevant to the outcome.

Muscle After 50: Same Engine, Different Fuel
2 min read 530 words
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