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Lifestyle factors add fuel to the fire. Melissa Hughe, National Technical Head at Henkel, points to stress, climate, and exercise as accelerants. “Stress, climate, diet, and even how often you exercise can accelerate how quickly oil builds up on the hair,” she explains. High-glycemic diets and elevated cortisol levels can nudge sebum activity higher, while hot, humid environments make greasiness impossible to ignore. Dr. Lisniak notes that “hot, humid climates (like Dubai), intense workouts, or wearing tight headgear can increase sweating and apparent greasiness.”
But perhaps the most overlooked culprit is product buildup. Heavy conditioners applied too close to the roots, silicone-laden serums, waxy styling creams – they all create a film that traps sebum and environmental debris. “Heavy oils, conditioners, or styling creams at the roots can trap sebum and flatten hair” says Hughe. The result is hair that looks dirty within hours, even if your actual oil production is moderate. It’s a common misdiagnosis: blaming your scalp for what’s actually a product problem.
The washing less trap
So what happens when you commit to the hair training protocol and extend the time between washes? Your sebaceous glands continue their work uninterrupted, but now the oil has nowhere to go. “Washing less often doesn’t truly slow down oil production – your sebaceous glands continue working at their natural pace,” Hughe explains. “What it does is allow oil to remain on the scalp and hair longer, which makes it look greasier.”
Some people do experience less rebound oiliness when they ditch harsh, stripping shampoos, but that’s about product choice, not frequency. But once your scalp normalises – usually within a few washes – oil output returns to baseline. You haven’t trained anything; you’ve simply stopped irritating it.
The distinction matters because it reveals what’s actually within your control. You can’t reduce how much sebum your glands produce, but you can avoid…
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