I used ChatGPT to help me go from 229lbs to 176lbs

A viral Reddit post has highlighted a novel use case for ChatGPT: personalized, evidence-based fitness coaching. The user, after failing with keto and carnivore diets, turned to the AI for guidance. ChatGPT advised ignoring common online fitness advice and influencers, instead advocating for a body recomposition strategy grounded in established science. The resulting plan was remarkably simple: maintain a modest 200-300 daily calorie deficit, walk 10-12k steps, lift weights, and prioritize all macros—not just protein—to aim for a slow, sustainable weight loss of 0.3 to 0.75 pounds per week.

The user's methodology involved a months-long dialogue with ChatGPT, using it as a learning tool to understand calories, macros, and weight loss science. A key tactic was copying transcripts from fitness YouTube videos into ChatGPT to vet the advice for scientific validity, helping filter out clickbait. The AI-generated "Simple Fat Loss Playbook" emphasized calorie balance, sufficient protein (0.7–1g per pound), and sustainability over speed. The user reported transformative results: improved blood work, better sleep, more muscle, and a leaner physique, crediting the AI's consistent, source-citable guidance for their 53-pound success.