Fitness

Do you suffer from allergies? Follow the dendritic cell and the entire Scientific American Allergy Orchestra to discover how allergens from pollen to pet dander can change the body's tune.

The computational immunologist Purvesh Khatri embraces messy data as a way to capture the messiness of disease. As a result, he’s making elusive genomic discoveries

Is it OK to use protein powder when you're pregant? Find out how much protein you and your baby need, what the best sources are, and how to make sure you're getting enough

The Whole30 nutrition challenge is wildly popular. But can it really deliver on its promises? Nutrition Diva examines the pros, cons, and alternatives

Journalist Bonnie Rochman talks about her new Scientific American/Farrar, Straus and Giroux book, The Gene Machine: How Genetic Technologies Are Changing the Way We Have Kids—and the Kids We Have.

Researchers have completed the first laboratory model of the human female reproductive cycle 

Two decades of research confirm that weight loss is about burning more calories than you consume—but what you eat is more important than how much you exercise

A neural circuit seems to control compulsive food consumption

Recognition of the risks posed by UV rays has motivated scientists to study what’s going on in our cells when they’re in the sun—and devise modern ways to ward off that damage

Online support groups aim to fill a void

Dwindling infection rate makes reliable data hard to gather

Activity trackers accurately reckon heart rate—but they're way off in estimates of energy expenditure. Christopher Intagliata reports.