The Fuel Journal

Insights for performance-driven nutrition

Guides, research, and playbooks for building sustainable habits

Cover Story

Feb 5, 2026 · 7 min read

The Importance of Protein: Why It's the Most Critical Macro for Weight Loss & Muscle Gain

proteinmuscle building

In This Issue

Discover why protein is the key macronutrient for fat loss, muscle building, and overall health. This article explains the science behind protein's role in metabolism, satiety, muscle repair, and body composition, plus how much you really need and the best sources.

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Latest Stories
02
ai

Mar 4, 2026 · 18 min read

The Best AI Nutrition Apps (2026 Edition)

AI nutrition apps promise faster food logging, smarter coaching, and better adherence. This 2026 gui…

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03
nutrition

Mar 4, 2026 · 15 min read

The Best Nutrition Apps (2026 Edition)

A 2026 guide to the best nutrition apps for iOS and Android. Compare calorie counters, macro and mic…

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04
nutrition coaching

Mar 4, 2026 · 15 min read

The Best Nutrition Coaching Apps (2026 Edition)

A 2026 guide to the best nutrition coaching apps, from AI coaching loops to dietitian telehealth. Co…

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Basics & Guides

Feb 5, 2026 · 36 min read

The Complete Guide to Macronutrients (2026 Update)

Balancing Protein, Carbs, and Fats for Health and Performance

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Top 10 Nutrition Myths Debunked

Jan 10, 2026 · 10 min read

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Understanding Calories: A Comprehensive Guide

Jan 8, 2026 · 8 min read

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How to Count Macros for Weight Loss: A Beginner's Guide

Jan 1, 2026 · 9 min read

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Macro Tracking & Meal Planning

Feb 5, 2026 · 24 min read

The Best Macro Tracking Apps (2026 Edition)

Find the perfect app to track your macros, calories, and nutrition goals. This 2026 guide reviews the top macro tracking apps for iOS and An…

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How to Count Macros for Muscle Gain: The Ultimate Bulking Guide

Jan 31, 2026 · 29 min read

macrosmuscle gain

How to Calculate Your Macros for Weight Loss or Muscle Gain

Jan 11, 2026 · 8 min read

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Understanding Macros: What Are Protein, Carbs, and Fats?

Jan 9, 2026 · 8 min read

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Common Macro Tracking Mistakes (and How to Avoid Them)

Jan 7, 2026 · 7 min read

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AI & Technology

Jan 23, 2026 · 4 min read

How AI is Transforming the Fitness Industry

Discover the revolutionary impact of artificial intelligence on exercise, nutrition, and overall fitness management.

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Easy Ways to Log Food and Track Macros with AI

Jan 23, 2026 · 9 min read

food loggingartificial intelligence

The Science Behind AI-Powered Nutrition

Jan 13, 2026 · 7 min read

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The Role of AI in Personalized Nutrition

Jan 5, 2026 · 7 min read

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Performance & Training

Mar 3, 2026 · 3 min read

Optimizing Your Health

Ten evidence-based health and fitness principles that cut through industry complexity with sustainable, high-leverage behaviors for training…

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Fuel Your Body: Nutrition Tips for Fitness Goals

Feb 2, 2026 · 9 min read

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How to Set and Achieve Your Fitness Goals

Jan 26, 2026 · 8 min read

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Podcast Reviews

Mar 2, 2026 · 14 min read

Best Peptide Advice From Huberman Lab, The Drive, FoundMyFitness, & Tim Ferriss (2021–2026)

Evidence-based takeaways from episodes discussing peptide therapeutics (GLP-1 drugs like semaglutide/tirzepatide, and research peptides like…

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Best Training Advice From the Huberman Lab Podcast (2021–2026)

Mar 2, 2026 · 18 min read

fitnessstrength training

Best Nutrition Advice From the Huberman Lab Podcast (2021–2026)

Mar 1, 2026 · 27 min read

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Best Health, Nutrition & Supplement Advice From Dr. Rhonda Patrick (FoundMyFitness) (2017–2026)

Feb 21, 2026 · 11 min read

rhonda patrickfoundmyfitness

Best Fitness, Nutrition & Longevity Advice From The Peter Attia Drive (2022–2026)

Feb 12, 2026 · 16 min read

fitnessstrength training

Best Health, Biohacking, Nutrition & Supplement Advice From The Tim Ferriss Show (2018–2026)

Feb 1, 2026 · 14 min read

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Reviews

Mar 1, 2026

Cronometer Review

Cronometer is the most rigorously data-correct nutrition tracker available — and a few ergonomic oversights and Health sync quirks keep it f…

Review
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Cal AI Review

Mar 3, 2026

Review

Carb Manager Review

Mar 1, 2026

Review

FatSecret Calorie Counter Review

Mar 1, 2026

Review

Lifesum Review

Mar 1, 2026

Review

Lose It! Review

Mar 1, 2026

Review

MacroFactor Review

Mar 1, 2026

Review

MyFitnessPal Review

Mar 1, 2026

Review

MyNetDiary Review

Mar 1, 2026

Review
Diet Guides

Calorie Counting

Calorie counting tracks daily energy intake against a target so you can create a deficit for fat loss or a surplus for muscle gain.

Diet
Read Diet Guide →

DASH Diet

Diet

GLP-1 Diet

Diet

High-Protein Diet

Diet

Keto Diet

Diet

Low-Carb Diet

Diet

Low-Fat Diet

Diet

Mediterranean Diet

Diet

Slow-Carb Diet

Diet

Vegan Diet

Diet

Vegetarian Diet

Diet
Compare
Feature
Fuel
Cal AI

Photo logging

FuelAccurate results you can correct in natural language
Cal AIOften misidentifies dishes and portions

Corrections

FuelSay 'that was 150g not 200g' and the edit sticks
Cal AICorrections don't save between scans

Apple Watch

FuelFull app with quick log, favorites, calorie ring, and water
Cal AIUsers report it doesn't work

Apple Health sync

FuelReads and writes everything: food, activity, nutrients, workouts
Cal AIOnly syncs water, not food
Read Full Comparison →See All Comparisons →

Guides

Setup

Help