It may be overeating and not obesity that causes health problems. When you think about it obesity is generally a result of overeating and weight gain is probably a healthy sign. After all the body is processing the extra calories and storing them for use at another time. The ability to gain weight is a healthy sign in an individual whereas unexplained weight loss while one is eating plenty would be an unhealthy sign.
When the fat starts to build up in places where it shouldn’t then severe health issues are to be expected. Fat in and around the heart and liver and inside the cardio-vascular system are potentially fatal.
Experiments with mice have shown that limiting calorie intake has greatly increased life expectancy and this may not be because the mice have stayed slim but that their vital organs have remained free of clogging fat.
Metabolic Syndrome Triggered by Overeating, Not Obesity – This article is about research that has shown Metabolic Syndrome is a result of too much food sloshing around the system and not simply weight gain.
I would think that the way to avoid this syndrome is to take my advice and go for long periods without food while doing at least four hours a week of decent exercise, ie more than just walking.