Pizza is about the worst thing you can put in your body. Most people cannot digest properly or are allergic to dairy and gluten. Ironically that was the straw that broke the camels back for me in 2014, I was at my brothers watching a UFC fight and brought a pizza over to eat. I got hot and my whole head and upper body turned beat red for a few hours. It just kept doing that every night and I started developing more and more symptoms. Low testosterone was the main culprit, so getting on HRT helped some, but correcting 47 years of eating foods I was allergic to and managing my stress better made all the difference in improving my blood work and now I feel like I'm in my 30's on most days where 5 years ago I felt like I was dying.
I'd start researching paleo and low carb diets. Read nutrition articles on bodybuilding.com or anywhere that seems reputable. I think Athlean X is pretty good for a youtuber but I don't hear him talk about diet very much. The main thing is to get your carbs from low glycemic fruits and colorful veggies, not pasta or bread, and try to avoid dairy and get allergy testing. Rotate foods every 4 days so if you are allergic to something you minimize the damage. I hope that helps. WIth google you can find info on all this stuff so easy.
Some people can turn a new leaf and just switch, others it takes time to slowly replace bad habits with good ones so its tolerable. It depends how motivated you are for change but once you are eating clean and proper 80-90% of the time you will start to feel a huge shift.
Ill pitch in a little bit, because I was doing a lot of research in this regard for my app.
There is ♥♥♥♥load of information on the internet and that is not neccesseraly a good thing. There are lot of diets, that compete:
-paleo
-vegan
-low-carb
-keto
-vegetarian
-carnivore
-etc.
My advice here is, do not subscribe yourself to one diet. You primarely need to listen to your own body - what tastes good, what agrees with your body and what leaves you with sufficient energy. In the end what works for one person might not work for another. There are not only genetic differences between individuals but also differences in your gut microbiomes. You will need to experiment.
Priorities go as follows:
1. You need to intake sufficient ammount of energy that covers your basal metabolism and energy expenditure through work, exercise etc. You can easily calculate that on any fittness calculator. I myself thought I ate a lot, whereas I had about 400 calories deficit.
2. You need to have sufficient intake of macro-nutrients: Carbs, fats and protein. Different diets promote different values for fats and carbs (low carb, high carb, low fat, keto). Most important however is sufficient protein, as those are broken down to amino-acids that are used by your body to build you cells, hormones etc.
3. You need to have sufficient intake of micronutrients - minerals and vitamins, that acts as catalysts and mediators in many bodily functions. Best solution to this is have very varied diet - different kind of vegetables, fruits, fats, proteins.
4. Timing - having your food at the same time everyday improves digestion.
To sum up eat enough of varied quality food, same time every day
Lastly it is important to pair good diet with exercise, quality sleep, social contact, hobbies and some sort of meaning.
ps. in regards to gluten and lactoce intolerance is blown out of proportions. They arent the best thing for your body, but if you dont consume too much of it it is fine. You do not need to avoid bread, pasta cheese etc, just downscale it and have more varied diet.
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