ADHD is forgetting unfinished projects exist until the next time you see them, and forgetting bills and paperwork exist until the next time you see them, and forgetting friends exist until the next time you see them.
I am very hesitant to assign obesity in the US to lifestyle.
Something is DEEPLY wrong with their food quality.
You know this because Europeans immediately gain weight in the US without changing their eating habits and lose the weight just as easily when back in Europe.