16. Sugary breakfast cereal
Starting off your day with a big bowl of sugary breakfast cereal is probably a mistake. Sure, it tastes good, and it’s usually colorful, but overloading your body with so much sugar, especially so early in the day, will lead to nothing but a big sugar crash just when you need to focus. Tomorrow morning, skip the frosted sugar puffs and go for fresh fruit to satisfy your sweet tooth, plus some protein and whole grains for energy that won’t cut out at a moment’s notice.