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Exercise increases the amount of muscle you have — and the more muscle you have, the faster your BMR will be. Exercise will generally help increase muscle. Studies show strength training (also known as resistance training or weight training) builds muscle more effectively and increases BMR.

Since metabolic rates slow as we age, food intake definitely matters. The rate at which our bodies use those calories determines whether or not the body uses or stores the food eaten.

Eating less causes the metabolic rate to slow down, which is not the desired effect. However, eating small, healthy meals every 3 to 4 hours keeps the metabollic rate high. It is important to make wise food choices like grains, fruit, vegetables, and legumes.

Spicy foods and hot spices have been shown to increase the metabolic rate. Adding red pepper or curry to your foods can help you boost your metabolism easily.

References: http://www.ehow.com/how-does_4710939_diet-affect-basal-metabolic-rate.html