The relationship between the severity of intellectual and developmental disabilities (IDDs) in adults with IDDs and eating and drinking problems and nutritional status.

While adults with severe IDD had more eating and drinking skill deficits (e.g. chewing problems and independent eating difficulties) and nutrition-related behaviour problems than those with mild IDD, the eating, drinking and swallowing problems, which may critically affect their food intake, were similar to adults with mild IDD. The anthropometric measurements and energy and nutrient intakes of adults with severe IDD were not significantly different from those with mild IDD consistently. Findings indicate that nutritional deficiencies and nutritional behaviour problems may be avoidable in adults with IDDs.