I'm not sure that you have correctly understood the use of 'God forbid'. We use it as a kind of exclamation, meaning that you fervently hope something will never happen. It's usually followed by 'should', indicating a subjunctive. For
example, 'God forbid you should ever be homeless'.
If you say 'God forbid I (should) stop eating peanuts', the implication is that peanuts are an essential part of your life, and you very much hope that you will never stop eating eating them. This is rather a strange thing to say. Is this your intended meaning?