If our body so completely adjusted to our lifestyles and food intake then malnourishment , undernourishment and hunger due to poverty wouldnt be a concern at all… so Mr. Bleach clearly didnt “research” thoroughly enough..sure your body can slow down the burn rate a bit more (just as heartrates for marathoners are muchhh lower than regular people) but it is only within the realms of the realistic..it isnt that if you run 24x7x365 ur heartrate goes to zero…(probably does but for different reasons)