You should not wash too often.

noli's read

This advice highlights the importance of preserving the skin microbiome and the skin's natural hydrolipidic barrier. Observational studies and dermatology reviews indicate that excessive cleansing, especially with harsh soaps or very hot water, can alter the balance of beneficial bacteria and lead to dryness or irritation (Source: Journal of the American Academy of Dermatology). However, the notion of 'too much' is subjective and depends heavily on an individual's activity level, climate, and skin type. There is no rigid scientific consensus on a universal frequency, but current recommendations tend toward a personalized approach rather than systematic full-body daily cleansing. The statement is therefore biologically grounded in the protection of the skin barrier, although it lacks practical specificity.

the sources

No named source held this one up — that absence is part of the verdict.