The main reason for eating three meals every day is to keep the body and brain
actively(active) enough(I would omit Enough if I were you). In fact, this makes people can spend(helps people to be able to spend) their day without any(much) tiredness. However, a lot of people now change(changed/have changed) in(if you want to use "in" it will be like "a lot of people brought change in their diet routine") their diet habit(diet routine now). Some become(became/ have become) eating just one meal or two(It should be either "one or two meals" or "a meal or two"(add "," before using "which") which are(included) lunch and dinner (add "only"). So,(I will take off "so" So, In spit of, sounds redundant) In spite of the importance of having a healthy breakfast, many people chose to skip it for some reasons.
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