Tomatoes are technically a nightshade..... so yes you shouldn't eat those either
all joking aside its best to eat fruit alone or don't eat it at all......wheat shouldn't be consumed by humans ..... no way in Hell should we mix it all together with sauce and cheese ...and don't mix sugars and fats unless you want to get fat.
But i only eat pizza when i am hungover from partying and dont give a shit about my stomach's health or paths of digestion...so load it all on there !