A 2009 study published in "Journals of Gerontology" compared the effects of a diet-only weight loss program with one of diet plus exercise on the body composition of overweight older adults. The results showed that although diet-induced weight loss significantly reduced muscle mass, the inclusion of exercise helped prevent muscle loss during Keto Ultra Diet  weight loss. Bone mineral density can also decrease during weight loss. In a 2009 study,

Hormonal changes

During weight loss and while maintaining a reduced weight, your body's levels of a fat-related hormone called leptin are also diminished. Unfortunately, this hormonal change makes it difficult to maintain weight, since the part of the brain that controls energy regulation will seek to return to the leptin levels the body had before weight loss through increased feeding and an expenditure of reduced energy A study published in "Journal of Clinical Investigation" in 2008 found that administering leptin injections to individuals who had lost weight helped reverse the increased hunger and decreased satiety that accompanies a reduced weight state.

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