Guides
Evidence-based answers on tracking meals and reading what the numbers mean.
- How accurate are calorie estimates from food photos?In a 2025 test, the best AI models’ calorie estimates from meal photos were off by about 36% on average, close to the error of a food diary.
- How to log meals from photos you already tookYour phone’s food photos record what you ate and when. Group them into meals, estimate each one, then add from memory what the photos missed.
- What your eating window is, and what it can tell youYour eating window is the time from your first to your last food or drink with energy each day. Over weeks, it shows your rhythm against your sleep.