On the cost of being fat, we can't neglect expected higher medical bills and lower wages, either. It's been proven in a number of studies that thin people out-earn fat people, so by low carbing, you may spend more on food, but you stand a chance of eventually reaping a monetary return on investment.

The other stuff mentioned -- clothing is cheaper, gasoline savings, life insurance costs, etc. all add up as well. But the big savings has to come from lower average medical bills and potential earnings.

A 350 pound person with equal qualifications will lose a job to a thin person, most of the time, so you can see how the fat have more limited options.

Low carb is more expensive, but it is a good investment.