Even for the most disciplined of dieters, snacks happen. And that's fine. Just don't pretend like it didn't happen. It's easy to think of our nutrition when it comes to breakfast, lunch and dinner. But it's the between-meal bites and little indulgences that can set you back—the vending machine runs, cake at the office party or a few late night drinks. To ensure these snacks don't set you over your calorie limit, use a calorie-tracking mobile app like MyFitnessPal or MyPlate to log each item. And try to do it before eating, so you can make the decision whether or not it's worth it.

The surest way to drive yourself crazy with desire for something is to tell yourself you can't have it. Minding your calories and your carbs is necessary if you're looking to shed some pounds but splurging with a cheat day or cheat meal is actually good for you. The human body is a masterful adapter. It gets used to the shortfall in calories so it starts burning fewer of them. Research published in the International Journal of Obesity found that splurging on carbs increases the hormones that boost your metabolism and muscle growth while reving up your body's ability to burn calories. So have that donut or pizza you've been craving, then get back on the road to clean, nutritious eating without derailing your progress.

Fruit is healthy, but keep in mind it's also loaded with sugar. Natural sugar, yes, but it can still be enough sugar and carbohydrates to impede your weight-loss. It feels like you're making the right choice when you snack on a bowl of fruit, but you're likely setting yourself up for a sugar crash (and hunger later) not unlike having some candy. To benefit from the many nutrients found in fruit, nutritionists suggest combining it with protein and fat (like 2% plain greek yogurt) for a satisfying snack or breakfast.

“People who eat like birds at breakfast often become hungry and overeat at lunch and dinner,” says Kate Davis, a Chicago-based sports nutritionist. She advises clients to make breakfast their largest meal of the day, then eat relatively less as the day goes on. If a big breakfast seems unrealistic (especially on work days), opt for something slow-burning like oatmeal. A recent study found that a bowl of oatmeal first thing in the morning can help you eat 50% less at lunch.

Nowadays, it's easy to say carbs are the enemy. And realistically, if you're looking to drop some weight, you should be cutting back on carbs. Especially the starchy, hand-cut and deep-fried variety. But cutting out carbohydrates from your diet is not only an agonizing endeavor, it deprives your body of the necessary fuel for workouts. You'll also be sluggish and irritable. Instead of eliminating them altogether, try to eat your carbs early in the day. And make sure you're chowing down on wholegrain varieties instead of the processed junk. As a rule of thumb, if it's white—be it bread, rice, potatoes or pasta—you should probably steer clear of it for now.