EAT stands for Exercise Activity Thermogenesis.
There is another component of physical activity, Non-Exercise Activity Thermogenesis (NEAT) that we will discuss tomorrow.
To differentiate, just think that EAT is going for a 5km run and NEAT is running for the bus. The difference is the intent to exercise.
EAT comes with progressions, so you will try to run your 5km faster. But you are unlikely to run longer for the bus, because you’ll just learn to get there on time.
EAT is essentially the component of energy expended above basal requirements during physical activity.
This is where Basal Metabolic Rate comes in handy.
Let’s say your BMR is 1500kcal/day, that works out at 62.5kcal/hour.
If you exercise for one-hour and burnt 500 total calories, we could minus the 62.5 and ascertain an additional 437.5 calories were burnt from exercise.
This number would help create the energy deficit required for fat loss.
EAT is the primary variable of energy expenditure that we can manipulate. We saw yesterday that Basal Metabolism varies little, and we’ll see the other components are quite consistent tomorrow and friday.
That means that exercising for longer, or with greater intensity, are the ways to increase expenditure.
I know it seems pretty obvious, but at least now you know why.