Users enter food in the MealPlot app and the chart logs protein and fiber content. The goal is that the daily food intake (blue dot) falls within the green target square. Disclaimer: AAAS and ...

Newer research suggests that most adults have higher daily protein needs than that — about 1.3-1.8 grams per kilogram of body weight — and that the government’s recommendations are too low.

The shape of a protein determines what it can interact with, just like the shape of a key determines which locks it can operate. Most of the proteins in your body can be grouped into four ...