There is a lot of comedy value in ure post! I cannot believe you told the gurdwara that the Granthi's are getting fat and how they shud get a rowing machine for them. lol.
But that aside, I think the problem is two fold for the majority of Indian people. Firstly I believe it is due to people mixing diets. What I mean by this is that in the Punjabi community we have lots of nice food. Nice food is not wrong since we all need fat but then you have people who love pakorey/samosa and also incorporate chips/pizza. These people basically mix fatty aspects of each diet.
Now imagine if there wasn't global communication - we wud replace chips/pizza with our dhaal. Many people wudn't eat crisps, chocolates, biscuits etc which wud mean punjabi diet alone works. I therefore feel its only troublesome when you mix it with other diets.
Also I reckon lifestyle choices are to be blamed.
Skipping meals, eating late lunches, eating just before bed = slow metabolism = fat storage. In the old days however - even in England people used to be up at the 4-5am....now a days people are up around 9-10am...imagine if we got up an hour earlier and had a proper routine of eating food at the correct time. This wud mean our metabolism wud be constant.
Also lets try to eat fresh not frozen food. I guess lack of labour intensive work is a factor but I know in India they eat something like 8 rotis wheras I only eat 1 roti!! Since for me food intake is automatically less I dunno how much emphasis to put on diet. I feel its kinda feel its more to do with the fact we get up late, skip meals to work long hours and then we out of all the world communities are more likely to mix the bad foods of both cultures....
In my opinion everyone shud stop eating the following - crisps, bisuits, chocolates, ice-cream, pizza, chips, meat, cheese, bread....stick to only fresh roti, fresh vegetable sabji/dhaal and fruits. Also everyone shud try to eat vegetables/fruits in season. On top of that increase activity time by getting up at 6am everyday. Now all I need to do is get someone to sign up my idea so I can make my billions by selling healthy lifestyle diet plans! :D