I've said to consult a dietician and/or a personal trainer. If you have physical problem preventing some exercising, they can help put something together.
Let's look at your investing example, though. That's a good parallel. If we had someone who was 40 years old, made good money and had very little retirement savings, what would you tell them? What if they kept looking for the quick fix (Bitcoin, meme stocks, shit like that) but multiple people kept telling them to not spend everything they make, max out your retirement accounts, and dollar cost average index funds for everything? What if they kept saying that might be easy for you but not them? Then when you examine their situation, you learn they have three cars and a boat. Money and food have a lot of parallels now that I think about it. While you need both, your emotions surrounding both drive a lot of the decisions.
Your analogy is a good one but me and some of others are arguing the long term solution. You have it backwards.