I’m 61 and never have been overweight by more than 5 lbs ever. Just eat my balanced meals and include desserts too. if I overeat on one meal I cut back some on the next meal. Just never developed a habit of consistently overeating or being too sedentary. Works for me and its not too complicated.
I had been backing off carbs and starches for a year until I went full Keto the week before Christmas. I’m down 18.3 lbs on diet alone....not much of an ardent exerciser....and have experienced a noticeable decline in brain fog and lethargy. Thus far, symptoms of “Kotex flu”have yet to appear.