[around the same time as the grenade training he recalls one of his scientists linking tomatoes to... lack of common sense. Instead of mentioning that, since that was during a bad period and he didn't want to think of anything from then, he decides to go with an argument he read in a social-help book]

Too much of even good things are bad for you. [there he comes off as concerned and still declines tomatoes. At least, that is his intention... probably doesn't translate clearly from brain to face]