Studies have shown that an increase in your metabolism causes you to lose weight faster.
They have also shown that eating spicy food helps in speeding up your metabolism which in turn helps in weight loss.
Chili peppers get their heat from capsaicin; this is the compound that causes a burning sensation when you eat it.
When you eat spicy foods, the capsaicin enters your body, causing heat to be generated in your body and thus burning calories quickly. You can see capsaicin at work when you eat spicy foods and find yourself perspiring heavily.
Aside from giving your metabolism a small boost, it is shown that foods with capsaicin also help you to feel full and satisfied faster, making your food intake and caloric intake smaller. The increase of your metabolism when eating spicy foods is small, usually only affecting you while you are eating and does not last any longer than that.
Although the heat gives your metabolism a surge, your tolerance to the heat and spiciness may dictate how much you can have. If you want to build up your tolerance, start with mildly spiced foods and increase it until you are comfortable and keep increasing it from there.
So, when they pass around those spicy wings grab one and chow down, it may actually count for an hour in the gym.