Can you increase the amount of brown fat?
well, this is a hard subject, we do not have the definitive answer to this. But in short the Answer is NO.
NO: You can not build new brown fat.
So what can you really do?
The cold is known to increase brown fat activtity and Cold induced thermogenesis, but not neccesary increase the amount of brown fat.
But please relax dudes, ICE swimming is GOOD. and it builds Brown fat, but it just doesnt build it by increasing the amount.
The Iceman (subject A) and his brother The NON Iceman (subject B) were studied during mild cold (13°C) and thermoneutral conditions (31°C). Measurements included BAT activity and respiratory muscle activity.
No significant differences were found between the two subjects, indicating that a lifestyle with frequent exposures to extreme cold does not seem to affect BAT activity and CIT.