the average weight of people who join weight watchers has gone up by two stone.

does that mean people are putting it off for longer?
or has our 'weight expectancy' increased in line with life expectancy - in other words, people are living longer, so maybe there is more time and opportunity to put on weight.

i suppose what we really want to know is whether weight watchers is keeping pace with demand and managing to deliver a higher level of weight loss.

i know it is a sensitive subject for some, but doesn't it all suggest that weight watchers isn't having much impact?