Jack Kruse is probably one of the least intelligent people I’ve ever read about, let alone the fact that he is a very bad person. "And people like Ray Peat, who is now dead, thank God" – Jack Kruse on the day Ray Peat died.
His advice is damaging for his followers. Two of his primary focuses are quantum biology (which by now is all quackery, full of chatter trying to sound as elevated as possible so that fewer people can understand it. I’m an aerospace engineer, and I cringe every time someone on the internet employs this sort of strategy), and light:
1. In respect of quantum biology: he recommends low-carb diets because of the deuterium content in some high-carb foods. As always with these quantum biology types, they completely ignore the big picture, focusing on the micro while losing all rational insight. This is the case here. Basic physiology 101: low-carb diets increase adrenaline and cortisol, inhibit the conversion of T4 to T3, and cause the release of free fatty acids, which are cytotoxic. If the fatty acids are unsaturated (like DHA), their breakdown products are the most significant markers of oxidative stress. Additionally, free fatty acids/ketones are worse fuels than glucose, which burns faster and produces more ATP per second. T3, on the other hand, stimulates mitochondrial biogenesis and supports every single complex in the electron transport chain and the Krebs cycle.
Following Kruse's advice will lead to: low T3, high cortisol, high adrenaline, free fatty acids in the blood (a semi-diabetic state), less T3 stimulation of ATP synthesis, more oxidative stress, and lower levels of progesterone, testosterone, and dopamine. All of this is exchanged for “deuterium depletion,” which, at best, is far less critical for mitochondrial function than proper thyroid function.
2. He doesn’t even understand his own thing. He claims to be the biggest expert on light, or at least he believes so, but he has recommended EMR-TEK panels (red light therapy devices) which are a waste of money and hazardous for those who buy them. These panels are far too powerful and can cause a biphasic dose response in the blink of an eye. Furthermore, their power diminishes very quickly with distance, with a steep gradient. For example, if you are very close – say, an inch away from the device – the power is very high and dangerous. But if you expose yourself at a distance of 2 inches, the power is extremely low and the treatment becomes ineffective. This means the panel is virtually impossible to use properly. He recommended these panels for years before even mentioning the biphasic dose response... quite astounding for the “biggest” light expert, putting at risk the lives of his followers.
Moreover, he has claimed that blue light diminishes ATP levels and causes neurodegenerative diseases. This is impossible, as blue light does not penetrate through to the brain. When discussing other consequences like disrupted sleep patterns, he is probably correct.
He is not only a very bad person but also possesses an undeservedly high ego and can’t stop making embarrassing moves. He simply takes advantage of people who want to improve their health or, even worse, those with unresolved health problems that conventional medicine has failed to address. He is the definition of a quack and snake oil salesman.