AbstractObjectiveExposure in utero to maternal diet can program offspring health and susceptibility to disease. Using C57BL6/JArc mice, we investigated how maternal dietary protein to carbohydrate balance influences male and female offspring appetite and metabolic health.MethodsDams were placed on either a low‐protein (LP) or high‐protein (HP) diet. Male and female offspring were placed on a food choice experiment post weaning and were then constrained to either a standard diet or Western diet. Food intake, body weight, and composition were measured, and various metabolic tests were performed at different timepoints.ResultsOffspring from mothers fed HP diets selected a higher protein intake and had increased body weight in early life relative to offspring from LP diet‐fed dams. As predicted by protein leverage theory, higher protein intake targets led to increased food intake when offspring were placed on no‐choice diets, resulting in greater body weight and fat mass. The combination of an HP maternal diet and a Western diet further exacerbated this obesity phenotype and led to long‐term consequences for body composition and metabolism.ConclusionsThis work could help explain the association between elevated protein intake in humans during early life and increased risk of obesity in childhood and later life.