Fatty matter is therefore that constituent of the body
which goes and comes most easily. Why there is in nearly every one a
normal limit to its accumulation we cannot say, nor yet why this limit
should vary as life goes on. Even in health the weight of men, and still
more of women, is by no means constant, but, as a rule, when we are
holding our own with that share of stored-up fat which belongs to the
individual we are usually in a condition of nutritive prosperity, and
when after any strain or trial which has lessened weight we are slowly
repairing mischief and laying by fat we are equally in a state of
health. The loss of fat which is not due to change of diet or to
exercise, especially its rapid or steady loss, nearly always goes along
with conditions which impoverish the blood, and, on the other hand, the
gain of fat up to a certain point seems to go hand in hand with a rise
in all other essentials of health, and notably with an improvement in
the color and amount of the red corpuscles.
The quantity of fat which is healthy for the individual varies with the
sex, the climate, the habits, the season, the time of life, the race,
and the breed.
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