This is unfortunately such a common side effect of Ritalin; it does away with the slightest appetite. There is nothing you can give him to boost his appetite, rather focus on a supplement such as Ensure, which will make certain he gets all the nutrients he needs and can help keep a little weight on him. I wonder if you can try giving him a really hearty breakfast before he takes his Ritalin as his appetite should be a bit better then. Some children experience constant nausea or stomach cramps which can also contribute to not wanting food. As difficult as it, try to make his food as attractive and nutritious as possible.
All the best,
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