Experts have found that there are some foods that need extra energy to be digested. That means burning calories does not occur after the food reached the stomach, but has been since we chew. In studies conducted in Japan, experts found that women who ate the food of this kind have a smaller waist size than those who eat food that's easy to chew.

The secret lies in the type of foods high in fiber and protein. In addition, there are several types of herbs and other substances that could actually help improve the nervous system and metabolic work up to 12 percent.

In his book, The Active Calorie Diet, Leslie Bonci, RD, a nutritionist from the UPMC Center for Sports Medicine, Pittsburgh, divide the food into several groups, namely:

Chewy foods (lean meats, nuts, fruits, and vegetables)
These foods will make the agency go directly to work so we chew. For maximal effort can munch, select foods in the form intact. For example, a grilled tuna meat, meat instead of canned tuna.

Hearty foods (fruits, vegetables, brown rice, wheat, and cereals)
In addition to making us chew more often, these foods are also rich in fiber. So, once we get into the stomach will feel full longer.

Energizing foods (coffee, black or green tea, dark chocolate)
These foods can increase metabolism. However, we should not mix it with milk, cream, or sugar. Green tea does not contain much caffeine, but in it there is catechins. These types of antioxidants can improve the metabolism of up to 4 percent. Meanwhile, dark chocolate contains catechins and caffeine. We only need about 28 grams a day. That was enough.

Warming foods (peppers, chili, cinnamon, garlic, ginger, vinegar, mustard, cloves)
The content of capsaicin in chili peppers can make the body burn energy more than twice as fast around a few hours after eating. Thus according to a new study from UCLA. In fact, not too spicy chili that could help erode the 100 calories a day. If you do not like spicy, try adding cinnamon, cloves, bay leaf, and garlic to the daily menu.