Muscles also provide mass for your body. You fill in, and it’s also important to note that, thanks to the contraction and expansion of muscles, you are able to move. Muscles work in pairs. For one part to contract, the other part has to expand. This enables you to move around. This also requires calories. The more calories are burned due to this huge amount of muscle contraction paired with muscle extension and enlargement, the more energy you burn. This is an important aspect of muscle maintenance and development that you have to keep in mind if you’re trying to lose weight. Your muscles actually play a big role in how quickly you lose weight. For example, your leg muscles are very long and require a tremendous amount of energy. If you were to put a lot of effort in working out your leg muscles because you’re running several kilometres a day or you’re putting in a lot of work at the gym doing squats and leg exercises, you can bet that you are going to be burning up a tremendous amount of calories. One key reason for this is because your muscles when they contract and expand, require oxygen. They also require nutrients and waste materials to be moved around a lot. All of these processes require calories. This is why accordingly, it’s a good idea to focus on large muscle groups if you are looking to lose weight. They are your ticket to massive calorie burning. In fact, if you pick the right muscle pairings, you would be able to burn calories in a very efficient way. Muscles are Crucial for Insulin Sensitivity Muscles also play a big role in how sensitive your body is to insulin. Now, insulin is crucial for weight loss. It really is. If you eat too many carbs and you have too much insulin in your system, this hormone will let in a lot of sugar into your body’s cells. This is a good thing because your body either needs fat or blood sugar for energy. Most of your body’s cells have these structures called mitochondria. These are small furnaces or energy houses that require specific types of molecules for them to produce the chemical energy they need to keep your cells alive. In the mitochondria, ketones made from the breakdown of fat and muscle, as well as blood sugar, are very welcome indeed. Your mitochondria can either use fat-based fuels like ketones or sugar-based fuels. Regardless, it needs fuel. Your muscles play a big role in insulin sensitivity because your muscles can also store blood sugar in the form of glucose. How? Your muscles can take up glucose in the form of glycogen. This is muscle-stored sugar. If you are in proper muscle shape, your muscles mass stores just enough sugar for your body to use it as energy. Now, if you have a sedentary lifestyle or your muscles are not in great shape, then your body will still be going to be storing glycogen, but it’s probably going to be shuttling it to your fat cells and storing it in the form of fat. This can happen quite a bit for people with unhealthy lifestyles or who have low daily physical activities. Insulin sensitivity, in this respect, takes place when your muscles can’t store enough glycogen so a lot of that sugar remains in your blood and triggers insulin, and your body starts storing more fat as a result.