Limit packaged foods, and read labels carefully when you can't
Packaged and processed foods are convenient, but that convenience comes at a cost, usually in the form of a bunch of added sugar, salt, and fat. "Knowing where your food comes from and what's in it is way more important than knowing how many calories or fat it has," says Harrison. When you can, try to cook from scratch, or at least choose snacks that don't have a laundry list of ingredients.
Actually use your health insurance
There's a reason you took the responsible job with benefits, so don't waste them. Younger people tend to put off regular checkups because they think they're untouchable. Wait, that's not true?! "A screening can find high blood pressure, diabetes, high cholesterol, and other issues that can be present without us knowing," says Dr. Alison Amsterdam, a physician at NYU Langone Medical Center, who also emphasizes getting a flu shot every fall.