Table 1.

Caloric densities (kcal/g) and macronutrient proportions (g/kg and % kcal) of the diets used in the cafeteria diet choice provided to rats before and after Roux-en-Y gastric bypass or sham operations

Diet	Caloric Densitya	Fat, g/kg;% kcal	Protein, g/kg;% kcal	Carbohydrates,b g/kg; % kcal	Sugar, g/kg;% kcal	Fiber, g/kg
Chow	3.36	50	239	487	62	5.1
		13.5	28	58	6.2
Beans (Low fat/low sugar)	1.0	18.7	59.7	156.7	7.5	5.2
		16.2	23.1	60.6	2.9
Yogurt (Low fat/high sugar)	0.9	11.0	48.5	154.2	145.4	0
		10.9	21.3	67.8	63.9
Peanut Butter (High fat/low sugar)	6.1	468.8	218.8	250	93.8	6.3
		69.2	14.4	16.4	6.2
Sugar-fat whipc (High fat/high sugar)	5.8	369.6	196.3	250	399.0	0
		57.3	13.5	29.2	27.5

^aCaloric density computed based on estimates of 9 kcal per fat gram, 4 kcal per carbohydrate and protein gram, and 0 kcal per fiber gram.

^bIncludes sugar.

^cSugar-fat whip is a wt/wt mixture of 17.4 g each of shortening and corn oil (9 kcal/g), 40.1 g powdered sugar (4 kcal/g), and 25.1 g whey protein (4.3 kcal/g).