Can someone explain this to me... study i found

The «rst issue to be considered is why the same
individual can apparently dispose of a considerable
excess of energy when the diet is low in protein, but to
a much lesser extent when the dietary protein level is
adequate? Bearing in mind the demonstrations of the
potent stimulatory effect of protein de«ciency on
thermogenesis (thereby underlying the low ef«ciency
of growth) in many species including laboratory
rodents, pigs, monkeys and human infants,12 ▒ 15 and
that other nutrient de«ciencesđfor example in vitamin
A, copper, iron and potassiumđalso result in
low ef«ciency of growth and increased thermogenesis,
16 the teleological argument can be put forward
that a high capacity to activate DIT has emerged
during the course of evolution as an adaptation to
nutrient-de«cient diets. As argued by Stock,11 the
necessity to increase DIT in the face of nutrientde
«cient diets probably had survival advantage
during the course of mammalian evolution since it
enables the overeating (on an energy basis) of such
nutrient-de«cient diets in an attempt to achieve an
adequate intake of the speci«c nutrient, but without
the disadvantage of excessive fat accumulationđa
hindrance to optimal locomotion, hunting capabilities,
and the ability to «ght or »ight. Viewed in terms of
survival value, it is therefore not surprising that
protein de«ciency is a most potent dietary stimulus
of thermogenesis, and Miller, who was very much
aware of this following earlier studies on protein :
energy requirements for maintenance,17 therefore
selected a low-protein diet in order to test the ability
of humans to resist weight gain during overfeeding.5,6