I'm a good saver of money but eat too much food. My parents (senior citizens that I now live with as a caregiver), instilled both sides of this in me.
Actually, while being overweight/obese their whole lives, they don't love variety/ ethnic food the way I do.
Anyway, I go on diets for 6 months, I go off diets. I eat my fruits and vegetables, I cook and eat out rarely, I walk at lunch. But I am overweight and struggle. Joy or frustration, I want to eat. Yummy or mediocre, I love free food. My boss was offering me sugar cookies her 3 yo made; I had to remind myself I do not like cookies. The week before I inhaled a free donut which again tasted all sugar. Why?
My point is that I'm lucky that my parents taught me and reinforce frugality. If you grew up with consumerism, it can be a struggle to cut back.
Like dieting, it's easy at first. You delay buying new clothes or sports gear, but at some point your family will nag you to level up with new stuff. Maybe at first they'll pay for your travel with them, but at your income expect you to contribute. Your friends will want to do a spa day, hair day, girl's trip. Not to mention the destination weddings. Having a burning desire for FIRE only gets you so far. My Mom had a heart attack 30 years ago so I'm conscious of the health effects of being overweight. I did really well for about 10 years, then began the slippery slope.