I agree that the medical literature does seem to suggest that the metabolic impact of vlcd's may vary from individual to individual. Or, it may be a cumulative effect and the studies that found no effect was an artifact of testing people with limited prior experience with vlcd's (Meaning the person who has been on two vlcd's of limited duration may have a metabolism much like a person who has never been on a vlcd, while a person who has been on vlcd's dozens of times, for months at a time, may have a very different metabolism. More research, at a deeper level needs to be done.
Of course, the biggest problem with these inconsistent results, is that a person is unlikely to find out whether they're an individual who will see an impact to their metabolism from a vlcd until after it occurs.
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