Mr. F. Le Mur writes:

Actually one's metabolism does change when calorie intake changes.
Lower calorie intake - lower metabolism.

The change is slight and largely temporary.

For example: "However, the major factor affecting resting metabolic
rate is decreased food intake with age."

BMR stays mostly the same to the extent that health is maintained. In
any case, falling BMR is not an excuse for obesity, nor is it an excuse
for failing to lose weight. These minor changes in metabolic rate are
never enough to make much difference in a diet program--their importance
is routinely exaggerated by those who are grasping for any way to avoid
responsibility for their own obesity.

--
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