Lactose intolerant is the inability to digest sugar in dairy products. Lactose intolerance is usually caused by a deficiency of an enzyme in the body called lactase.
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A phrase to describe a negative feedback loop could be: self-regulating (though I'm not sure the exact word you're looking for).
A natural process of self-destruction in certain cells, such as epithelial cells and erythrocytes, that are genetically programmed to have a limited life span or are damaged. Apoptosis can be induced either by a stimulus, such as irradiation or toxic drugs, or by removal of a repressor agent. The cells disintegrate into membrane-bound particles that are then eliminated by phagocytosis. Also called programmed cell death
