Did you know that there are two different types of fat in your body, white and brown? While the white fat stores energy from the food we eat, brown fat burns the fat to produce heat in the body. Both white and brown fat tissues also have their own immune systems, and scientists are only just beginning to understand how these work. The good fat is found near our necks and shoulders and keeps us lean, by converting fat to energy. The bad fat pads your bellies, hips and thighs, stores calories. A type of immune cell that guards us from infection, Gamma delta T cells, have a key role in turning bad fats into good fats and also in protecting you against the common cold. This is what you can do have more good fats: portion control (use 7-inch appetiser-sized plates for main meals) as weight gain can harm the immune system; avoid sugar and refined carbs; add nutrients to your diet, say, vitamins C and E, omega-3 fatty acid, bioflavonoids found in vegetables and fruits, foods rich in immune-boosting zinc, like beans; sleep for at least 7-8 hours daily, as sleep deprivation can weaken your immune system.