Hygral fatigue is inevitable with every wash. See
here for more info.
However, I really wouldn't fret. Its effects are very minor, even on fine hair. The effects of heat, chemical and mechanical damage are far, far more severe.
The LHC "advice" of stretching washes and avoiding sulphates/cones ... really isn't that.
Trying stretching washes is advised for those who wash daily and have greasy hair as for some people that greasiness is a result of excessive washing and excessive stripping. If that's not your problem, stretching washes is going to do nothing for you except make you look like a greaseball and risk inducing yeast-based conditions such as seborrheic dermatitis (SD).
Likewise, cutting out sulphates and cones is certainly fashionable in some circles but it's hardly a universal recommendation or a universal fix. Cutting out sulphates is good for those with a sensitivity to sulphates or with skin conditions like eczema and it's probably a good idea anyway as
sulphates can cause skin thinning. However, sulphates are good because they clean better, you can generally stretch washes longer when using them and, for some people, they help control SD. Cutting out 'cones is mostly based on the myth that they dry out hair by forming an occlusive barrier (false) or that they ruin hair by causing build-up (true, but only if used unwisely or excessively). Some people's hair doesn't like 'cones (true) but other people's hair is much more manageable with them.
Tbh, the only real LHC rule is: YMMV. I think you should try listening to that one...
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