Metal is not typically very active. I think you meant "mental". Intellectual more often refers to topics in the arts and sciences, especially involving new ways of thinking about advanced topics in these fields of learning.
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soheil1CJ, he said:"Many investigations have shown that mental concentration can be affected when doing intellectual activities in the morning without having had breakfast previously, and that a proper breakfast helps to keep the mental performance in that moment of the day, according to tests on memory and attention."In my opinion this is not the usual usage