A diet full of processed foods and simple carbohydrates, which have a high glycemic index, eventually will lead to a slower metabolism. (scientificamerican.com)
Despite its lower starch content, potato has a high glycemic index varying between 69 and 98, while the glycemic index of brown rice is lower, between 48 and 62. (healthyeating.sfgate.com)
That is why wheat bread has a higher glycemic index than table sugar. (marksdailyapple.com)