Opposed to popular opinion, fats are actually useful and beneficial for the human body. At the same time, this does not mean that you can eat all fatty food without limitation. So called trans fats and saturated fats, taken excessively, increases the risk of heart disease and obesity, because 1 gram of fat has about twice as many calories per gram as carbohydrates and proteins (Web MD). On the other hand, a healthy diet should include monounsaturated and polyunsaturated fats. Monounsaturated fats are contained in such products as oil, peanut oil, and olive oil, as well as avocados, nuts, and seeds. Polyunsaturated fats, including Omega-3 and Omega-6 fatty acids, can be found in fatty fish such as salmon, herring, mackerel, anchovies, and sardines (Helpguide). One should also try different types of protein, simultaneously moving away from making it the center of your daily meals.