Well, you need to break that down into good fats and bad fats as good fats can promote weight loss as well, and you don't want to eliminate as much of those as you can. Regarding carbs, not all carbs are the same, as better carbs such as whole grain breads will keep you feeling fuller longer than white breads.
Also another plus for whole grains, soluble fiber, found in oats and barley, has been linked to lower levels of insulin and bad cholesterol (think: diabetes and heart disease), and insoluble fiber in whole wheat reduces risk of gastrointestinal maladies like diverticulosis
In a 10-year Harvard study completed in 1994, men and women who ate high-fiber breads had fewer heart attacks and strokes than those whose tastes ran to bagels and baguettes.
Simply switching from white to whole wheat bread can lower heart disease risk by 20 percent, according to research from the University of Washington reported in the April 2, 2003 issue of The Journal of the American Medical Association.
The list goes on and on, but you get the idea
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