<unk>  in animals (including humans) is a set of adaptive biochemical and physiological changes, triggered by lack of food or extreme weight loss, in which the body seeks to conserve energy by reducing the amount of calories it burns. Equivalent or closely related terms include famine<unk> ,<unk>  mode, famine mode,<unk>  resistance,<unk>  tolerance, adapted<unk> , adaptive thermogenesis, fat adaptation, and metabolic adaptation. Bacteria become highly tolerant to antibiotics when nutrients are limited.<unk>  contributes to antibiotic tolerance during infection, as nutrients become limited when they are sequestered by host defenses and consumed by proliferating bacteria. One of the most important causes of<unk>  induced tolerance in vivo is biofilm growth, which occurs in many chronic infections.<unk>  in biofilms is due to nutrient consumption by cells located on the periphery of biofilm clusters and by reduced diffusion of substrates through the biofilm. Biofilm bacteria shows extreme tolerance to almost all antibiotic classes, and supplying limiting substrates can restore sensitivity.
Starvation response
Reproductive compensation
Respiratory adaptation
Homeostasis
Neural adaptation
Compensatory growth 
Counterregulatory eating
Respiratory compensation