 [ Symptoms ] can viagra cause prostate cancer [ Disease ] diets are generally not effective    especially for school age children or teens sugar and food coloring are not the cause of adhd nor are food allergies in general food coloring can have a small barely measurable effect but this is not the cause of your child is adhd  that said there are a few nutriceuticals that may improve adhd studies are limited the amount of benefit is likely to be less than medication and they may not benefit all kids with adhd