I don't think that will prevent obese people from being obese since they are mostly the rich people. The only thing that could help against obesity is better healthcare education and not increasing the price of sugar and food that has high amounts of sugar in it.

Atleast that is my opinion but it might be worth a try.

Edit: My bad I didn't read the article. It says climate crisis is increasing price for sugar around the world. Not something I personally care about because I don't eat a lot of sugar but this still might help against obesity. Allthough I don't think rich (fat) people will care enough and just buy the food anyways since price isn't the problem.

It's already problematic getting a black coffee from McDonalds before nightshift. Way to many people put a lot of effort into getting "ready" and are content with dining at McDonalds. It's not like they have an emergancy. They really get ready and eat there and act like it is a real dinner where I see it as a necessity or emergancy before I starve or am tired (coffee). It took me 20 minutes just to get a coffee cause they ordered food. I always wonder where these people get the energy from leaving home, driving to a McDonalds and eating there. So much better options to cook at home.