This low-calorie snack will satisfy your craving for something salty and crunchy, and it’s also a good source of fiber, De Fazio says.

Fruits are packed with vitamins and minerals, and are full of great natural sweetness, Maftoum says. "They are also a great source of antioxidants needed for a stronger immune system and a better performance at work."

Fresh fruit is always a great snack option — but if you want to mix things up, try dried apricots, raisins, apples, or bananas. These snacks are sweet, chewy, high in fiber, and high in potassium.

The brain draws nearly all its energy from glucose, which is the most important simple sugar in human metabolism, Maftoum explains. "Consumption of low glycemic index foods like bran flakes will release glucose at a slow rate in the bloodstream, which will minimize blood sugar swings and optimize brainpower and mental focus."

Be careful with these! Some protein bars are packed with calories. Check the ingredients and make sure the one you pick has fruit, nuts, and fewer than 200 calories.

Rice cakes are great because they are low calorie and come in different flavors. For instance, you can get cheddar or caramel, depending on whether you want salty or sweet, De Fazio says.

Though they’re salty, pretzels are low in fat and give you some carbs to hold you over until lunch or dinner, De Fazio says.

This is a great substitute to ice cream, which is rich in sugar and fat. A medium-sized banana contains the needed amount of glucose by the brain to perform at its best.

If you have an office refrigerator, these are good sources of protein to have on hand. "Protein will keep blood sugar levels steady and will not make you sleepy," De Fazio explains.

These are perfect for satisfying any salty, crunchy, or spicy craving — and they have protein and fiber, which will energize you and prevent blood sugars from dropping.

This is an excellent source of protein, which will satisfy hunger and stabilize blood sugars. But be aware of the offensive smell! Eat your hard-boiled egg in the office kitchen.

Hummus and veggies, like carrots, provide crunch, sweetness, and carbohydrates. "You get all the nutrients you need with this satisfying snack," De Fazio says.

The chickpeas in hummus are also a good source of calcium, iron, protein, and fiber, which prevents blood sugar levels from rising too rapidly, Maftoum explains.

Sometimes when you think you are hungry or crave sugar, you are actually thirsty, De Fazio explains. Next time this happens, try drinking a can of low sodium tomato or vegetable juice.

Many yogurts are made using "good bacteria," which is great for your digestive tract. Yogurt also contains probiotics, and offers protein, calcium, vitamins, potassium, and magnesium.

The apple provides fiber and carbohydrates for energy, while the peanut butter (you can also use almond butter) provides healthy monounsaturated fat and protein, which stabilizes blood sugar ups and downs. "This snack is so tasty and satisfying and will hold you over for a few hours," De Fazio says.

12 Things Successful People Do Before Breakfast