Rats, ZuckerObesityDiabetes Mellitus, Type 2ThinnessBody WeightInsulinBlood GlucoseAdipose TissueInsulin ResistanceEatingRats, Mutant StrainsBody CompositionMuscle, SkeletalGlucoseHypoglycemic AgentsThiazolidinedionesLeptinTriglyceridesLiverThiazolesReceptors, LeptinDisease Models, AnimalMice, ObeseOrgan SizePhysical Conditioning, AnimalDiabetes Mellitus, ExperimentalFatty Acids, NonesterifiedGlucose Tolerance TestHyperinsulinismHyperphagiaLipid MetabolismWeight Gain