The old apple-a-day advice is still very much alive and well among health practitioners. Keith-Thomas Ayoob, EdD, RD, associate clinical professor in the department of pediatrics at Albert Einstein College of Medicine in Bronx, New York, often keeps an apple with him during the day. “It’s loaded with pectin to help keep you feeling full, and there are plenty of varieties for your taste,” he says. “Fuji, Honeycrisp, and Cripps Pink (Pink lady) are my favorites,” he says, noting that large apples run about 100 calories. For the staying power of protein, consider adding a tablespoon of peanut butter or a cheese stick. Here are 30 more healthy snacking ideas for adults.