Tell me /fit/, is LCHF a valid diet under any circumstance?

Yes, for everybody who doesn't do high intensity exercise.

For high intensity exercise (strength training, sprinting, etc.), a small amount of carbs are necessary.

"PPAR-alpha activity is required for ketosis. Mice lacking PPAR-alpha have reduced ability to enter ketosis (R, R2).

People with ApoE3 (CT for RS429358) and ApoE4 genotypes (CC for rs4712) may have very high cholesterol when they consume a high saturated fat diet (R). Therefore, the ketogenic diet may be contraindicated for these people, especially for managing cardiovascular disease risks.

Epileptic patients with SNPs in KCNJ11 (rs8175351, rs5219, rs5215) and BAD (rs34882006, rs2286615) genes had lower responses to ketogenic diet treatments after three months (R)."

Think about what ancient people ate
> Red meat
> Fish
> Dairy
> Small amounts of complex carbs( wild rice, tubers, berries etc.)

Basically if you aren't a faggot about then yes it is a good diet

Humans have been eating complex carbohydrates as the main source of their calories since we became our own species. Well since the industrial revolution that is.

Eating a high fat diet is unnatural, unhealthy and uncivilised.