How are there good overweight monks?

If you are mindful you don't eat for taste - so chances are you over eat are smaller. There are a few monks I know and I truly believe are advanced practitioners (meaning I won't be surprised if they are arahants) who are overweight. And this really clashes with the concept of eating mindfully - can someone help reconcile the fact they are overweight and being advanced practitioners ? Edit : just to be clear there are overweight people who eat little and have self control and healthy but have bad metabolism which makes them fat ... and skinny people who are gluttons and eat a lot of fat foods and are still skinny .... I'm just giving the most extreme example which are of monks who are extremely mindful and don't need to give 0 consideration to enjoyment from the food and are aware of their bodies.