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Yes, excess yin energy -- mostly in brain, constantly thinking, imagining; can't focus. Making focus requires more yang energy.
Yang energy is more slow, sustained, even burning. Yin is fast, hyper. Yin plants grow fast. Yang plants take more time to grow.
Drugs are needed if diet is bad only. If diet is changed no drugs are needed. You are on the right track. Ritalin speeds up brain more than it already is so this makes brain more tired faster.
You said your sister is vegetarian, correct? I am therefore assuming that the child is eating vegetarian way as well. Since no animal food is used in the diet this means diet is always on the yin side; making more yin energy. Yin energy goes up to head and activtes brain more. Yang goes more to body (brain waves slow down).
If your sister cooks more whole grains and use a little more fish and less simple carbohydrates, concentrated sugars, eliminates fruit juice, tomatoes, and other excess yin in diet the child will soon be OK. More exercise all around is also good. As body activates, thinking becomes more stable.
I hope this helps.
In peace, Roy
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