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'Refined carbohydrates' are carbohydrates that have been processed in some way, such as table sugar (sucrose), high-fructose corn syrup (found in many processed foods), white flour, and pasta.Found mainly in fruit, vegetables, beans, grains and milk.By triggering the 'reward' centre in our brain, they may be especially good at over-riding these controls.įoods can be divided into three groups (although most foods are a mixture): High-sugar and high-fat foods taste good and can make us feel good too. The important thing seems to be that certain foods can cancel out these natural feedback systems that should keep our weight the same. In other words the body adjusts how much energy you use up depending on how many calories you eat. If you eat more calories, this increases the amount of energy your body uses, ie eating more may make you more active.Exercise also makes you tired, so you reduce the amount of energy your body uses later on.
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If you exercise, this is followed by by a period of increased hunger, ie doing more makes you eat more.If you eat fewer calories, not only does this make you hungry but it also reduces the amount of energy that your body uses, ie eating less makes you less active.The medical term for this is homeostatic feedback. There are also several hormones involved, including insulin, ghrelin and leptin. There are nerve connections between the stomach and the brain. There are lots of ways that the different parts of the body communicate with each other to keep body weight the same. However, there is now research that shows that this explanation, sometimes called the calories-in/calories-out model, is outdated. Doing more physical activity (using up more calories).Eating less (taking in fewer calories from food).So, to lose weight, you need a calorie deficit.