(gentle music)
- [Narrator] Did you know your brain is responsible
for when and why you eat?
It's true.
All day, your nervous system,
which includes the brain,
receives signals about your appetite
from hormones that come
from different parts of your body,
like the stomach, intestines, and fat tissue.
These hormones signal the brain
to help manage your appetite,
including hunger and the feeling of fullness.
Both the brain and these appetite hormones
contribute to what, why, and how much you eat,
including for hunger, for pleasure.
In reacting to these impulses,
the brain decides what action to take.
But for people trying to lose weight and maintain it,
changes in appetite hormones can make things tricky.
That's because when we lose weight
by eating fewer calories,
our levels of appetite hormones can change.
The hunger hormone, called ghrelin,
increases after weight loss,
while appetite hormones that help us feel full,
including the ones you see here, decrease.
When this happens,
it may signal to the brain
that we feel more hungry and less full,
which causes us to eat more.
This response to weight loss can make weight management
as challenging as actually losing the weight.
Now that you know the truth,
learn what you can do about it.
Visit TruthAboutWeight.com.