Yet another diet book, with yet another gimmick, by the authors of the popular Life Extension and Life Extension Companion."" This is a do-it-yourself biomedical fat loss handbook,"" claim Pearson and Shaw, who contend that by following the guidelines set out here, the reader is assured of fat loss without restrictive dieting or excessive exercise. The key is GH, or growth hormone. Apparently, as we age, our capacity to secrete GH declines. By taking GH releasers (vitamins or nutrient supplements), adults can stimulate the quick weight loss of adolescents, and food is easily converted into muscle, not fat. This regimen is complicated, and despite the authors' many warnings, it could be harmful to some if not followed carefully. The detailed analyses of its chemical effects on the body are filled with scientific jargon and processes. Only the truly dedicated will care to plow through it all. Even then, they would be advised to ask their physician first.