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John abstained from normal food and drink, perhaps fasting in ways unlike those employed by the Pharisees. The people saw this unusual lifestyle as the result of a demon (see John 7:20, John 10:20).
When John appeared, he was not accustomed to eating and drinking in the ordinary way, for he lived an ascetic life, abstaining from normal food and drink. Perhaps he fasted in ways different from those employed by the Pharisees. The people attributed this unusual lifestyle to the influence of a demon, an evil spirit: You must be in league with the devil, for you deviate from what is ordinary
(see John 7:20; John 10:20)1
18 For John came neither eating nor drinking, and they say, ‘He has a demon.’