What are Calories, and what is the difference between good and bad calories? 
 Calories are the physical units for measuring heat and energy. The nutritional energy contained in fat, protein, and carbohydrates (also knowns as macronutrients or macros for short) is expressed in kilocalories (kcal or Cal) and makes up your daily caloric intake. Our bodies need the energy provided by these macronutrients to function properly. If you consume fewer calories than you burn, you will lose weight. On the other hand, if you consume more calories than you consume, you will gain weight. Calories are categorized as good or bad based on the sources, and its positive or negative impacts on our body. Negative impacts to body include increased risk of cardiovascular diseases, inflammation, and depression. Bad calories come from sources like meat, fat, sugar and processed foods. Good calories come from eating a whole-grain diet high in fruits, vegetables, legumes, fish, and nuts. That said, you should listen to your body, and do what feels right and avoid thinking in terms of “good” or “bad” food. Just be aware of how different foods make you feel, and your mind will automatically tune into this over time and help you fight craving foods loaded with bad calories.