Why Some People Burn More Calories Than Others

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In this Metabolic Classroom episode, Dr. Bikman explains mitochondrial uncoupling, a process where cells burn fuel without converting all of that energy into usable ATP. Normally, mitochondria are “coupled,” meaning fuel burning is efficiently converted into cellular energy. But when mitochondria become uncoupled, some of that fuel is released as heat instead—like revving a car engine while it’s in park.

Ben explains that this process is especially important in fat tissue. White fat is designed for energy storage and tends to be tightly coupled, while brown fat is rich in mitochondria and uncoupling proteins that burn fuel to generate heat. He then connects this physiology to insulin, showing that insulin appears to make fat-cell mitochondria more tightly coupled and efficient, lowering energy expenditure and making storage easier.

The opposite happens when insulin is low and ketones rise. Research from Dr. Bikman’s lab shows that ketones, especially beta-hydroxybutyrate, can increase mitochondrial respiration in fat cells without a matching rise in ATP production—clear evidence of uncoupling. In human fat biopsies, elevated ketones were associated with markedly higher mitochondrial respiration, suggesting that ketosis can make fat tissue more wasteful with energy.

The larger takeaway is that calories still matter, but hormones influence how efficiently those calories are stored or burned. When insulin is high, the body stores energy efficiently. When insulin is low and ketones are elevated, fat-cell mitochondria may become more uncoupled, allowing more energy to be dissipated as heat rather than stored as fat.

References:

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NOTE: The information presented is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Dr. Bikman is not a clinician—and, he is not your doctor. Always seek the advice of your own qualified health providers with questions you may have regarding medical conditions.

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