HealthDay
Researchers review evidence for forthcoming guidelines by the U.S. Preventive Services Task Force
Small study found they adjust physical activity based on their social network
Experts say proof is lacking for these techniques in other disorders, too
Don't neglect exercise
Under-30s most likely to use tanning beds or sunbathe, online poll suggests
More intense PE curriculum paid off academically in Swedish trial
Expert offers advice on working out in your 50s, 60s, 70s and beyond
Heirloom tomatoes, which have more naturally occurring chemicals than supermarket varieties, won taste tests
Symptoms more likely to spike after mountain climbing, skiing and even flying, study says
