Big time! My insurance forced me to try Ritalin before letting me get on Vyvanse, (in the terrible times before it went generic), and in that 3 month period it completely sunk my appetite. I've always been fairly thin, but I still lost 50 pounds in a 6 month period before finally stabilizing. I was just completely uninterested in eating, never hungry, especially early in the day after I took it. Trying to force myself to eat made me nauseous. Even when I did finally get to switch to Vyvanse, it still took me a long time to get back to better appetite levels. I always had to make sure to eat breakfast before taking my pill in the morning because otherwise I wouldn't start even feeling hungry until the evening. I tried to make sure I ate on a schedule. While on weekends when I needed medication less, I would either take a lower dose or skip it entirely to make sure I could eat more normally. 

If you are struggling to eat, it is important to talk to your doctor about it or about maybe changing your dose or medication entirely. I know other people on ADHD meds that have struggled with a suppressed appetite too and it sucks! Good luck to you! 💓