Eggs cause fatigue for me. Any guesses as to why?

So, every time I have tried to go with just meat, it gets insanely expensive. Eggs are cheap, easy, they can’t be portable, and I’d really love to make 80% of my diet that. However, for whatever reason, they caused me to be lethargic. Does anyone have any ideas why that would be? Obviously, meat does not do that. But it is expensive. I can’t afford it.

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