Summary
Carl Franklin and Richard Morris, two software developers who reversed their type 2 diabetes through ketogenic diets, break down the science and marketing claims around exogenous ketone supplements. They distinguish between the metabolic benefits of making ketones through dietary carb restriction versus simply consuming them, arguing that exogenous ketones won't drive weight loss since they add calories rather than mobilize stored fat. The episode covers the chemistry of racemic BHB ketone salts, explaining how manufactured ketones contain both right-handed (physiologically active) and left-handed (less useful) isomers. They identify legitimate therapeutic uses including cancer therapy via glucose-ketone index management, Alzheimer's and Parkinson's cognitive support, and elite athletic performance as a third fuel source, while warning against MLM marketing that overpromises weight loss benefits.
Key Points
- Making ketones through carb restriction burns body fat; eating exogenous ketones adds calories and won't drive weight loss
- Commercially manufactured BHB is racemic, containing a 50/50 mix of right-handed (physiological) and left-handed (less useful) isomers
- The body can slowly convert left-handed BHB to acetyl-CoA through a four-step pathway, but it lacks the therapeutic signaling benefits
- Legitimate therapeutic uses include cancer therapy (targeting 1:1 glucose-ketone index), Alzheimer's and Parkinson's cognitive support, and elite sports
- Taking exogenous ketones to recover from carb cheating is counterproductive and extends the time needed to return to ketosis
- Exogenous ketones with high insulin levels from carb consumption means the ketones compete with glucose for mitochondrial access and get excreted
- D-beta-hydroxybutyrate (right-handed) is the physiologically relevant form; products listing only beta-hydroxybutyrate contain the racemic mix
Key Moments
Making vs eating ketones: why exogenous ketones won't drive weight loss
The hosts distinguish between the fat-burning process of making ketones through carb restriction and the act of consuming exogenous ketones, which adds calories rather than mobilizing stored body fat.
"Isn't it? Well, there is some signaling involved in having ketones in your blood, but the whole point of making ketones is burning body fat to make ketones. Right. You're not going to lose any weight if you eat ketones. That's right. Because you're adding energy into your system. Right. So we all agree we want ketones because they feed our brain, they feed our organs, they are good therapeutically. However, if weight loss is your goal-"
Racemic BHB: the left-handed isomer problem in ketone salts
Richard Morris explains that manufactured BHB contains a 50/50 mix of right-handed and left-handed isomers, and the body only naturally produces the right-handed form, which is the physiologically active version.
"physiologically we only make the right-handed shape of isomer. And we've evolved to make this. We've evolved to use it for energy."
Cancer therapy use case: targeting the glucose-ketone index
Mark Miller's cancer research found that achieving a 1:1 glucose-ketone index ratio creates an environment that denies tumors the fuel they need to grow, and exogenous ketones can help reach this therapeutic target.
"if you have 3.5 millimoles of glucose, approximately 3.5 millimoles of ketones, you have a glucose ketone index of one. And that's supposedly the ideal environment to deny cancer, the food that it needs to multiply and grow."
