Is there a problem with using the PEG that I missed? Why isn't he getting enough calories via PEG feedings?

Sometimes patients undergoing tx are unable to eat/drink for a period of time for various reasons - it is not always a lack of will or emotional problems, sometimes medical reasons make it impossible to swallow or tolerate food & liquids. That's why a PEG is inserted. If nausea with PEG feeding is the issue that needs to be handled with anti-nausea meds which Christine has already outlined. Is a nutritionist involved in his care?