Well, the spoilers for a manga like this could involve plot twists like finding a unique diet method that works wonders or facing setbacks that make the journey more complicated. Maybe there's a surprise friendship that helps with the diet too.
Well, to understand such manga, you need to look at how the lady navigates through various social situations. Also, notice the details in her appearance and behavior changes. Another tip is to think about the underlying values and messages the story conveys.