How does our body identify calories across similar types of food (how “filling” it is)?

Question

For example, consider water and protein shake – both are liquids of similar viscosity and sensation. How does my stomach feel fuller when I drink the shake?

In: 2

Answer 1

It’s called the [gut-brain connection](https://www.health.harvard.edu/diseases-and-conditions/the-gut-brain-connection). Your liver has hormone receptors that can detect protein and fat. This causes your gut to shut down the production of hunger sensation-stimulating hormones like ghrelin, and this makes your brain tell you that you are satiated.