Duh! Even though we all know fried foods are a healthy diet’s arch-nemesis, fries (sweet potato or not—sorry!), chicken fingers, and onion rings are the default side dish to meals everywhere. Elisa Zied, RD, and founder of Zied Health Communications, says portion sizes of these artery-clogging items at restaurants and sports venues can be twice or three times the amount, equaling a diet disaster. “If you’re going to have fried food, share it,” she says. “Or order the smallest size possible, and keep it to once in a while at best.” Even better, Zied says, is making healthier versions of familiar foods at home, such as baked fresh-cut fries with a drizzle of olive oil. Just for fun, check out “50 Unhealthiest Foods On the Planet” Review for other foods to avoid.