I have PTSD so I am typically in a state of constant stress, sometimes its worse than at other times. But yeah a lot of times I can't eat because of it, I will make the effort but sometimes just the thought makes me nauseous.......like I am subconsciously thinking 'and how the hell are you going to digest that with all your energy going to anxiety and watching your back.'

So yeah too much stress can certainly interfere with that, as from my understanding it causes less energy to go to things like digestion because the energy is going to trying to cope with the stress mentally. Only think I know that helps is to reduce the stress but that is much easier said than done.