Calories Per Pound of Fat |
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Calories per Pound of FatThere are 3500 calories per pound of body fat. In order to lose just one pound of stored fat we need to burn off 3500 extra calories, sounds simple, yet so many dieters claim to cut enough calories per pound each week but hardly lose any fat. Calories per pound will never add up when losing weight!
If daily calorie intake is cut by 500 less than the body requires it seems logical that fat stores will supply the additional energy requirements. However energy metabolism is complex and can be different between individuals. Which fuel the body uses depends on many factors; fitness levels, present energy stores, motivation levels, type of exercise chosen, genetic predisposition and nutritional state are a few of the important factors. During a calorie reduction some fuel from fat stores will be used as that's the role of excess body fat. The problem is that fat is not the best source of energy for the cells. Muscle cells need a constant supply of oxygen in order to burn fat continuously. At rest enough oxygen can easily be supplied but resting hardly uses any calories at all, we may only burn 50 calories an hour. Remember we need to burn 3500 extra calories per pound of fat so we must actively move to increase the total calories burned, now this is where things can get complicated! Exercising obviously burns many more calories but due to low fitness levels most sedentary people cannot supply enough oxygen to enable millions of working cells to continue burning fat for energy. The cells must use another fuel, preferably a quick-burning fuel that requires no oxygen - the role of carbohydrates! The result is carbohydrates and fats are BOTH used to supply the cells energy with carbs being the predominant fuel. The proportion of carbohydrate to fat used depends on factors such as the individual fitness level and the type/intensity of exercise performed. These facts help explain the reason calculations become confusing, dieters reduce intake in calories per pound of fat without realizing that body fat cannot make up all the deficit in calories. The main point here is that we need to burn a far greater number of calories per pound of fat to burn off one pound of fat!!
Q. Is this why low carb diets work well, by limiting carbs to cells they use more fat? A. Well, to a small degree yes! Low carb diets can help some people lose weight however most of the loss will not all be fat especially in the initial stages when weight loss is rapid. Remember I said cells cannot use all fat for energy because they need to be supplied with sufficient oxygen to burn it, also overweight people tend to have lower fitness levels than lean people thus their bodies cannot always keep up with oxygen demands required when exercising. Our body has a clever mechanism for energy metabolism, if carbs are limited it simply burns more protein by converting it to carbs in the liver, a process known as Gluconeogenesis. Gluconeogenesis actually goes on all the time but if carbs are restricted the process is accelerated especially during exercise or even light activities for many overweight people. More protein lost from cells results in increased fluid loss from the body! As we have an abundance of protein in the body simply cutting carbs wont transform the body into a lean fat-free machine!! Remember the body always burns a combination of fats, carbohydrates and protein and there is more reliance on the latter two fuels when movements demand more effort and therefore oxygen. To burn off enough calories per pound of fat we need to take into account the number of calories that come from carbs and protein! The best way to accelerate fat loss is increase the basal metabolic rate so we burn more fat calories at rest, remember oxygen supply is sufficient to burn up to 90% of energy as fat so increased calorie burning at rest really does help fat loss. Tom Venuto teaches thousands of people to use anaerobic exercise to increase the metabolism and burn off enough calories per pound of fat!
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