【答案解析】The harm of overweight to health can't he underestimated (there is no underestimating the harm of...). There is evidence that many diseases are related to overweight. It is worth noticing that more and more people (an increasing number of people) work out at fitness clubs or take up jogging (there are more and more.., who...). It seems to me that the most undesirable way is to try to lose weight by skipping breakfast.