There is not such thing like over weight.You just happen to live on wrong planet.Move to Mars and weight 1/3 rd
to
Moon to loose five/six of your weight
or
Space Station to stay weightless entirely.
But what is most fascinating - the fact there are start growing lettuce and strawberries on the Space Station- so diet becomes more refined now.
It helps to loose even more weight ( at least till Space Chicken arrive to Space Station and KFC opens stores there)

Grown in space food looks appetizing
but not always

Now imagine that in the nearest future here on Earth instead of a tasty beef burger, you come for fast food outlet and suck some algae straight from the plastic tube.
Algomat will feed all future generations.You may have one even in every home, that site beside washing machine and fridge - to produce fresh and healthy algae for the whole family.No needs for supermarket shopping or pizza delivery.