Fitness gurus and healthy eating fanatics are always raving about the importance of downsizing portion sizes and why it's important to eat small, frequent meals throughout the day. If you want to lose weight and keep up with your weekly fitness routine, eating mini meals really is the way to go. Small, well-balanced meals throughout the day will keep your energy levels up because your blood sugar remains stable. This means you don't experience 'highs and lows' just from eating different foods, and you can actually get through your day without getting too hungry.

The best way to keep up with this habit? Pack a day's worth of food in a lunch tote and carry it around with you. This reduces the risk that you'll overeat at the next meal, and also prevents you from making an unnecessary trip to the nearest fast food pit stop or clearing out the vending machine.

Some of the best foods you can pack include whole grain crackers, lean meats, low-fat cheese sticks, yogurt and meal replacement bars. If you plan to eat a complete meal at the office, make sure it's a well-balanced one. For most people working in an office, staying focused is a priority; you can avoid the late-afternoon slump by making sure the center of your meal is high in protein. Grilled, skinless chicken breasts, grilled salmon, or even tofu will fill you up fast and keep your energy levels up throughout the day.

If you're planning to hit the gym before heading home after work, you will need to pack a few extra foods to make it through your workout. Eat a high-protein snack right before the workout to maximize the calorie and fat-burning potential of your routine. Make sure you drink plenty of water during and after your workout, and eat a combination of protein and carbs to refuel and restore your energy levels.

For the final meal of the day, go light; a lean protein for dinner coupled with a large salad is the ideal menu item at the end of the day. If you're craving something a little heartier, stick with smaller portions so you can enjoy your favorite meal without the guilt!