IMHO eating and exercising serve two entirely different purposes.
Eating is needed to stay alive. Don't need to exercise to stay alive.
For me eating is largely in the necessary class, albeit having a DW as great cook and my sweet tooth, liking chocolate makes it enjoyable. Before DW, eating was a strictly survival affair.
Exercise is to feel good, maintain agility, balance, poise, good walking form. Also improve and maintain ju-jutsu skills simply because it is elegant, slick, and graceful, all the while giving a quiet confidence to handle unpleasant encounters. Another activity I have pursued for about thirty years, is what I call the "practical application of the walking cane". It is an innocuous object in the hands of persons my current age. It is in fact a formidable tool if properly applied. The forms are again, a graceful but very effective forms of exercise, non-threatening to the casual observer.
The weight business I look at simply as an input-output balance. Simply controlled with pair of favorite shorts. When it begins to feel tight - reduce input. If it needs a belt to hold it up -increase input.