You got your issues diagnosed by a competent medical professional, well done. If you go onto a career in the fitness industry you will find this is actually a very rare thing. Most food "intolerance" - and veganism, for that matter - is simply a more socially-acceptable eating disorder. This is why women more often claim intolerances and choose veganism than men; it's not a different physiology or being more ethically aware or whatever, it's just "well this stuff will make me fat, and that is the worst thing in the world." That plus some anxiety issues usually covers it. An actual diagnosis or ethical choice is pretty rare.
I'm not "giving it to Kyle" but I am aware that the reason he thinks my food sucks is because I am vegan (people attack me for it all the time in person and online even though I don't impose my views on everyone).
I didn't say
you sucked, I said
your food sucked. This is not an attack on you. You are not your food choices. There is rather more to you as a human being than what you shove in your gob. I know that in these days of popularised eating disorders - "I'm becoming a fitness model! Look at my instagram account! Yay chia seeds!" - that it's trendy to consider that there is nothing more to you as a human being than what you eat, but that's bullshit and one day we will look back on these years and shake our heads sadly the way we do with 70s flares and moustaches. So it's not an attack on you, just your food.
I say your food sucks based on results. This is how I assess someone's diet:
1. are you feeling good?
2. are you getting stronger and fitter?
3. if you want your body to change, is it changing the way you want it to?
If the answer to all 3 is "yes", then your diet is perfect, I don't care if it's cigarettes and KFC, it's obviously working for you. If the answer to one or more of those questions is "no", then we need to change something. Yes, even if you "count your macros" and all that. Steer as you go.
You are not feeling good. You are not getting stronger and fitter. You've not commented on your body, let's assume you're happy there. But that's still two out of three "no". So your diet needs work.
Obviously there are other aspects to it all like sleep and training programme and medical history and all that. But diet is a very common issue early on in someone's gym career. We look for obvious solutions before the more obscure ones.