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FAT LOSS: COUNTERACTING ENERGY SPARING ADAPTATIONSThe loss of body fat can lead to a range of physiological outcomes which, in turn, affect the further loss of body fat. Physiological adaptation to weight and fat loss can be divided into predictable changes (such as the decline in RMR in response to the loss of lean mass) and adaptive changes (where the body actively works to reduce the rate of weight loss). Dr Rudy Leibel and his colleagues from Rockefeller University in New York have tried to quantify the adaptive changes in lean and obese people as they lose weight. For a 10 per cent weight loss, they found that total energy expenditure declined by about 450kcal, of which about half could be explained by the changes in body composition and half could be considered adaptive. The main way of counteracting the adaptive reductions in energy expenditure is through physical activity. This has been shown in several studies to counteract the energy sparing effects of dietary restriction. It does this by increasing energy expenditure both during and after exercise and by maintaining lean body mass. Studies examining exercise, however, have not always been convincing, possibly due to the difficulty in getting people to comply with the exercise regimens that have been set for them. There is still enough evidence to suggest that exercise can help with those who do comply and indeed may be the most effective form of continuing fat loss in the maintenance stage. There is little argument amongst scientists that diet appears to have the most immediate effect on fat loss, but it is now also becoming increasingly clear that exercise should be the mainstay in any fat loss maintenance program *167\186\4*         Random PostsLeave OneYou must be logged in to post a comment. |
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