How to pronounce “leanness” in English

by under eating and overeating, why would you even think to explain the generalized obesity by overeating? Or, in those cases, often these textbooks, pre-World War II weretitled 'Obesity and Leanness' because they were looking at cases that today we would call anorexia and assuming that that also wasn't an under eating problem. It was someproblem of how the fat tissue was regulated.