Only eating steak. Is this a good idea? Thinking if seeing how it affects my gains.

Destroyed by arguments. I win another internet debate once again. I am unstoppable.

>0% b12

Main article: Vitamin B12 deficiency
Vitamin B12 deficiency can potentially cause severe and irreversible damage, especially to the brain and nervous system.[6][21] At levels only slightly lower than normal, a range of symptoms such as feeling tired, weak, feeling like one may faint, dizziness, breathlessness, headaches, mouth ulcers, upset stomach, decreased appetite, difficulty walking (staggering balance problems),[12][22] muscle weakness, depression, poor memory, poor reflexes, confusion, and pale skin, feeling abnormal sensations, among others, may be experienced, especially in people over age 60.[6][12][23] Vitamin B12 deficiency can also cause symptoms of mania and psychosis.

Fiber is not an essential nutrient. Vitamin K2 is found only in animal foods (with the exception of natto, which most vegans aren't eating). Not only is K2 an essential nutrients that most vegans aren't getting; it can also be converted into K1 but your gut flora, precluding the need to consume green veggies. And K2 isn't even included as part of "Vitamin K" on Cronometer. Not to mention bioavailability of nutrients. You aren't absorbing half the nutrients in plants because they're either wrapped up in fiber or they come with enzyme inhibitors that disable and damage your digestive system. Then there's B12, of course. You can't get it from plants, and many people can't absorb the supplements, which leads to irreversible neurological damage. Vegans inevitably become malnourished because we aren't herbivores.