If you’re eating so many carbs that you’re obese, you can afford to reduce the carbs and buy some nutritients.
http://well.blogs.nytimes.com/2007/12/05/a-high-price-for-healthy-food/
University of Washington research (2007).
Calorie for calorie, junk foods not only cost less than fruits and vegetables, but junk food prices also are less likely to rise as a result of inflation...
Foods with high energy density, meaning they pack the most calories per gram, included candy, pastries, baked goods and snacks. Although fruits and vegetables are rich in nutrients, they also contain relatively few calories.
The survey found that higher-calorie, energy-dense foods are the better bargain for cash-strapped shoppers. Energy-dense munchies cost on average $1.76 per 1,000 calories, compared with $18.16 per 1,000 calories for low-energy but nutritious foods.