Table 1.

Selected characteristics of the experimental diets

Diet	Preference Ratio, %			Energy Density, kcal/g	Macronutrient Composition, kcal %
	Harlan LM-485 (Regular Chow)	5TUM Diet (Chow A/I)	5TUL Chocolate Diet (Preferred)		Carbohydrate	Protein	Fat
Harlan LM-485 (Regular Chow)*		13.9±7.0‡	9.3±3.6‡	3.41	66.0	21.0	13.0
5TUM Diet (Chow A/I)†	86.1±7.0‡		8.8±3.7‡	3.30	65.5	24.1	10.4
5TUL Chocolate Diet (Preferred)†	90.7±3.6‡	91.2±3.7‡		3.48	66.8	20.5	12.7

Preferences are expressed as means ± SE and were calculated as the % of total intake (kcal) by acclimated male Wistar rats (n = 6/preference test) in two-choice 24-h preference tests where preference ratio = 100 × Row/(Row + Column) of intakes. (row vs. column). Diet specifications are available in Supplemental Table 1 and as follows: Harlan LM-485 (Regular Chow; http://www.teklad.com/standardrodentdiet/r7012.asp), 5TUM Diet (Chow A/I; http://www.testdiet.com/PDF/5TUM.pdf), and 5TUL Chocolate Diet (Preferred; http://www.testdiet.com/PDF/5TUL.pdf).

^*Harlan Teklad, Indianapolis, IN.

^†TestDiet, Richmond, IN.

^‡P < 0.001.