NIH scientist Kevin Hall knows eating ultra-processed foods cause us to gain weight and overeat. That doesn't mean he avoids ...

The amount of sperm released decreased sharply with each mating during a single day, reducing the males' fertilization rate.

Fish and shrimp are full of tiny particles from clothing, packaging and other plastic products, that could affect our health.

A new tally finds dozens of species giving food a second go-round, from babies boosting their microbiomes to adults seeking easier-to-access nutrition.