Yes, but temporarily, and only slightly. Your metabolic rate is determined by your gender, act height, age, body weight and composition. Eating fiery foods can lead to a slight uptick in metabolism as the body temperature goes up and heart beats faster. However, as soon as your body's reaction is over, your metabolism will function as before. But spicy foods may help in weight loss by inducing satiety. Capsaicin, the pungent ingredient that gives chillies their fiery kick, seem to trigger the release of neurotransmitters in your brain that control hunger and feelings of fullness.