Eat This, and here's why.

Pick a nutrient, a feeling or the time of day. Eat This names the plain food that does it, the number for one serving, a cheap pick, and when it's a question for your doctor instead.

This guide explains how it works: how foods are ranked, where every number comes from, how sure we are about each suggestion, and what the app keeps about you.

• 128 whole foods, every value linked to USDA FoodData Central or IFCT 2017.
• 10 nutrients, each opening with the best food, the best cheap one and the one worth paying more for.
• 10 feelings, each checking warning signs before it lists a single food.