I RECOMMEND EXERCISE AND A LOW-CARB DIET: Americans 20 pounds heavier than in 1990.

Check out Gary Taubes’ advice. And there’s also the Livestrong App.

UPDATE: Reader Newell Wright emails: “Last January, I saw a post of yours about following a low carb diet and bought Taubes’ book. Nine months later, I am down almost 70 pounds and feeling great. Thank you for alerting me to low carb, as I had never heard of it before. Literally, that post last January has changed my life.” Glad to help!