Give two people the same slice of bread and their blood sugar can react in completely different ways — one barely moves, the other spikes hard. This isn’t a rounding error. Landmark research on personalized nutrition found that individual responses to identical meals vary so much that population-level “good” and “bad” foods break down at the personal level.
Which raises an awkward question for every nutrition label and glycemic-index chart: whose body are they describing? Not necessarily yours.
A glycemic index is an average across test subjects. It’s useful as a rough map, but it can’t account for your sleep, your gut microbiome, your activity, the order you ate things in, or what you ate yesterday. The “healthy” food that calms one person can spike another.
The only way to know your response is to measure your response.
A study with thousands of participants tells you about a population. A study with one participant — you — tells you what to actually do at your next meal. That’s an n-of-1 experiment, and it’s exactly what a food-and-response journal is for:
Log a meal, add a glucose reading or two afterward, and Bodyproof shows your baseline → peak impact automatically. Do it across a few meals and the Insights view ranks your biggest spikes and your calmest foods — for you, not for the average of a thousand strangers.
Stop guessing how food affects you. Prove it.
Bodyproof is a personal tracking and educational tool, not medical advice, diagnosis, or treatment. It is not a diabetes management app. Consult a qualified professional for medical decisions.