Instant Oatmeal...

Those little packets of breakfast cereal cook so quickly because they're processed, meaning they have a high glycemic index so your body also digests them quickly. Translation: You'll be reaching for a mid-morning snack to tide you over in no time.

Healthier swap: Slow-cooked oats take longer to make, but they're also less processed, have a low glycemic index, and will keep you full until lunch. To save time, whip up a batch of steel-cut oats on the weekend, and then divide them into individual-portion Tupperware packs, which will make it easy to just grab the container and heat it in the microwave. Stir in sliced apples, cinnamon, and a drizzle of maple syrup for taste.