12 Answers

I judge by clothing size, like when I can no longer fit into a 12.........but the guy in the picture obviously has big cloths...........

Some never do! Go on a diet that is.

When you can no longer get out through the kitchen door, for one.  ;).

When do you think one should finally go on a diet?  

I’m always on a diet. My weight remains the same +/_ 10 lbs. for the last 20 years. I would have to buy a new wardrobe if I went over or under too much. I eat small portions and never go for seconds or rich desserts. 

I eat small meals , so I am not overweight. I would think if you are 20 lbs or even more overweight, then it could become a problem. It puts stress on your joints  and can cause many other problems.

It's easier to lose a couple of kilo's than the body wight of an entire person, I watch my weight and am fortunate enough to have to be too diligent, but a couple of family members are obese, I don't understand why they have not or did not do something about this problem, they are now suffering serious consequences, diabetes, joint replacement etc yet they still continue on a high fat, high sugar and gross portion diet

When a single flush just won't do it anymore.

Perhaps when your belt size is equator..

There was a report recently about a girl who had to be taken to hospital by demolishing part of her house. Apparently she weighed 700lb.

NOW.  Was at a bowling tournament this weekend and took something to wear that had an elastic waistband so I could bend over comfortably.  I will NOT go buy bigger clothes.  I've ranged from size 6 to size 16 over the years. As long as I am in single digit clothing, I'm OK. 
But I've gained a lot of weight since mid-December, and haven't been exercising. My back is having trouble supporting my front, so it's time to take care of business.  

For too many there is no limit...