I did 90% carnivore for about 6 months, dropped 20ish lbs. The headaches from the lack of electrolytes were the main thing I thought was a downside. And it was hard to be around people in social situations. I stopped drinking and most bar food was trash. Beyond that, wasn't hard.
If you sit a lot in your day to day life, it might not be just weakness of your hip flexors but a combination of weak/contracted tight hip flexors, a weak abs, and a tight lower back.
All that stuff plays together to create anterior pelvic tilt, where your back is compensating for weakness in...