In a world that celebrates productivity, efficiency, and doing everything faster, eating has become ‘just another task’ to rush through. Eating occasions are squeezed between meetings, eaten while standing, scrolling, driving, or replying to messages.

But here’s the thing - your body doesn’t experience eating as a quick event. It experiences it as a conversation – the communication between the gut and the brain via the gut-brain axis. It’s a slow and complex exchange of signals that need time to process.

When you eat too quickly, you interrupt that conversation (rude).

It’s not a case of “being mindful” – although please eat mindfully. It’s a case of biology.

The signalling process.

You might know you’re eating, but your brain doesn’t know instantly – it is a little slower on the uptake. This might be a difficult concept to get your head around – but your brain need as bit more information than just “I am eating.”

Information transfer starts with the mouth when you initiate chewing. It travels to your stomach, through your intestines, and finally ends up at your brain.

This communication pathway is the gut–brain axis: the signalling that is sent via the nerves (especially the vagus nerve), the hormones released from the gut, and from mechanical stretch receptions in the stomach and intestines.

All of this takes time.

On average, it takes around 15–20 minutes from the start of a meal for satiety signals to meaningfully register in the brain. If you finish eating in only 5 minutes, you’ve effectively outpaced your own physiology.

What is actually telling your brain “I’ve eaten”?

Firstly, ‘satiety’ – what is it? It’s the feeling of being comfortably satisfied. It is not always the same as ‘fullness’ – generally, fullness follows satiety. You know when you go out for a big meal? You ‘have enough’ and feel satisfied, but you keep eating? That’s fullness.

What’s happening to reach a feeling of satiety?

The food enters the stomach and ‘stretch receptors’ are activated. These send signals via the vagus nerve to the brainstem, essentially telling the brain “food is here.”

This happens relatively early, but it’s not enough on its own to create fullness.

This is where gut hormones play a role. As nutrients move into the small intestine, specialised cells release hormones - Cholecystokinin (CCK), GLP-1 (which explains their use in weight-loss jabs), and Peptide YY (PYY).

These hormones act directly on appetite centres in the brain, and cause the slowing of gastric emptying, reduction in appetite, and an increase in feelings of fullness.

These hormones are released in response to nutrients, not just volume — and they take time to have an effect.

Nutrients: not all macronutrients signal at the same speed.

Different macronutrients stimulate satiety signals at different rates and intensities:

Protein is the most powerful macronutrient for triggering fullness through the stimulation of CCK, GLP-1 and PYY, and produces longer-lasting satiety. But protein digestion and signalling are relatively slow. If you eat protein too quickly, your brain doesn’t get chance to catch-up before your plate is empty.

Carbohydrates are digested more quickly, especially refined carbohydrates. They produce faster rises in blood glucose, triggering insulin release as well as some gut hormones. Satiety signals rise faster than protein but will often fall sooner. When eaten very quickly and in isolation, it’s easier to overshoot consumption before fullness is felt.

Fats significantly slow gastric emptying and contribute to satiety later in a meal and after it. They don’t create strong immediate fullness signals; the effect is more delayed. Meals high in fat, eaten too quickly, can lead to unintentional overeating – think of it like the brakes are applied too late.

The speed at which we eat can lead to a mismatch between behaviour and biology.

Multiple studies show that faster eating rates are associated with:

• Higher energy intake per meal.

• Reduced satiety.

• Increased risk of weight gain over time.

When time is limited, it can feel difficult to slow down your eating, but it doesn’t have to mean putting your fork down after every bite, or always “eating mindfully.” It simply means giving your gut–brain axis enough time to process your behaviour.

Here’s what you can do:

• Sit down when you eat.

• Minimising distractions [at least] for the first 10 minutes.

• Chew more than you have been.

• Allow pauses within the meal.

Even small changes can shift the timing enough for satiety signals to land before you’ve eaten beyond what you need.