Why Is It A Bad Idea To Eat Really Fast?

Yes, eating too fast is bad for you. Your gut needs roughly 20 minutes to tell your brain that you are full, so fast eaters pack in extra calories before that signal arrives. Over time this drives overeating and weight gain, dulls the flavor of your food, and can leave you bloated and prone to reflux.

We all have that one friend who, during a friends’ dinner party, wolfs down their entire meal by the time you’ve taken your third or fourth bite. Looking in their direction, we can’t help but ask, ‘Do you even taste your food?’

No matter what their response may be, it’s highly unlikely that they do.

Perception Of ‘Eating Speed’

There are several reasons why some people tend to eat fast, from the texture of the food on their plate to lifelong habits picked up at the family dinner table (more on those below). That said, it’s difficult to tell if a person is eating “too fast”, because it’s also about relative perception. Look at it this way; while having lunch with a couple of friends, you might end up being the last one still busy with the final bites on your plate, although everyone else is long done. They throw you encouraging glances to convey the message, ‘It’s alright, take your time’, but you’ve already started shoveling the food into your mouth to avoid any further embarrassment.

In this case, there might be nothing wrong with your eating speed; perhaps your friends just eat too fast. However, the uncomfortable situation may not feel that way in the moment. Later, when you go home at night, and are having dinner with your family, you may be the one finished first if you particularly love the dish or are hungry, while everyone else may take 5 minutes longer. It’s all about perception between the people eating!

Drawbacks Of Eating Too Fast

Obesity

There are many problems associated with eating too fast, and they seem pretty obvious once you think about them. To start with, eating fast can potentially make you obese. How? Allow me to explain.

More Calories, Less Fullness

It all comes down to the physiology of the human body. From the time you start eating, it takes roughly 20 minutes for your gut to send ‘fullness’ signals to the brain that tell you to stop. Hormones like cholecystokinin (CCK) and leptin, along with stretch receptors in your stomach wall, all have to chime in before your brain decides you’ve had enough. Therefore, when you eat too fast, you pack in far more calories than slower eaters before that signal ever arrives. According to a study of middle-aged Japanese men and women published in 2006 in the Journal of Epidemiology, people who described themselves as ‘fast eaters’ were considerably more likely to be overweight, precisely because rapid eating outpaces the body’s satiety signals and encourages overeating. On the other hand, eating at a leisurely pace gives you ample time to realize that you’ve eaten enough and to properly enjoy your meal.

No Taste At All!

Many ‘fast eaters’ would deny this, but it’s true! If you eat too fast, there is a very good chance that you wouldn’t ‘sense’ the taste of the food as fully as a person who eats at a slower pace. According to a study titled “Optimal directional volatile transport in retronasal olfaction”, a fast eater cannot experience the smell of the food as completely as one who is eating slowly.

Bloating And Reflux

Eating in a rush isn’t kind to your stomach either. When you bolt your food, you also gulp down a lot of extra air, a phenomenon doctors call aerophagia. All that swallowed air leaves you bloated, burping, and uncomfortable. It can also make heartburn worse: a distended, gas-filled stomach pushes upward and triggers the lower esophageal sphincter to relax, which lets acid splash back up into the esophagus. Wolfing down a large meal in one go also means barely chewing it, so your stomach has to work harder to break down big chunks of food, which can leave you feeling heavy and sluggish.

How Long Should It Take You To Eat?

That entirely depends on the amount of food you’re having. The ideal time to spend on a snack can vary significantly from the time you should take over a proper meal. Still, eating for at least 20 minutes is considered a good general rule of thumb when it comes to the time you should devote to a meal.

As food (or water) starts to fill your stomach, stretch receptors are activated, which in turn send signals to the brain through the vagus nerve, the nerve that connects the brainstem and the gut. As partially digested food enters the small intestine, hormones such as cholecystokinin (CCK) are released, reinforcing the message that you’ve eaten enough. Taken together, these processes take, on average, roughly 20 minutes (depending on your metabolism) to make you feel full.

It’s alright if you’re particularly busy or running late to get somewhere and thus cannot devote as much time to eating. However, making a habit of eating fast is definitely going to set you back in the long run. Therefore, take your time and relish each morsel of food that you choose to consume. Remember… a delicious meal is a journey, not a race!

Why Do Some People Eat Faster Than Others?

So why is it that your friend can demolish a meal in the time it takes you to butter a slice of bread? It turns out eating speed isn’t random; researchers have pinned down several things that nudge the pace at which we eat.

The biggest culprit is often the food itself. Soft, smooth, energy-dense foods (think a burger, white bread, or a milkshake) almost demand to be eaten fast. In a controlled study published in PLOS One in 2014, volunteers ate the same meals prepared in “hard” and “soft” textures. The hard versions slowed people’s overall eating rate by roughly 32%, with smaller bites and more chewing per mouthful, and led to about 13% less energy (calories) eaten at lunch, with no catch-up overeating later that day. The softer the food, the bigger the bites and the faster it disappears.

Distraction is the next big factor. When your attention is on a screen rather than your plate, you stop registering how much and how quickly you’re eating. A 2025 systematic review and meta-analysis in Nutrients found that eating in front of the television significantly increased how much people ate, partly because the distraction blunts the brain’s record of the meal and weakens the fullness signals we rely on to stop. Eating on the go, standing at the counter, or scrolling on your phone tends to pull your attention away from your meal in much the same way.

Finally, a lot of it comes down to habit and individual differences. Many fast eaters simply learned to clear their plate quickly as children, whether from large families, short school lunch breaks, or busy households. A 2021 systematic review and meta-analysis in Healthcare noted that across several studies fast eaters were more likely to be male, although the authors were careful to add that it isn’t fully clear how much of this is physiology versus learned lifestyle. In other words, if you’ve always been a quick eater, you’re not imagining it, and the good news is that the same factors (chewier food, fewer distractions, slowing down on purpose) are exactly the levers you can pull to change it.

Eating Fast And Your Long-Term Health

Packing on extra weight is the most obvious downside of eating fast, but the research suggests the effects run deeper than the bathroom scale. Speed-eating has been tied to a cluster of problems doctors call metabolic syndrome: a combination of a large waistline, high blood pressure, high blood sugar, raised triglycerides, and low “good” HDL cholesterol that together raise the risk of heart disease and diabetes.

A 2021 systematic review and meta-analysis in Frontiers in Nutrition pooled 29 studies covering more than 465,000 people. Compared with slow eaters, fast eaters were about 1.5 times as likely to have metabolic syndrome overall (odds ratio 1.54), and they also showed higher odds of central (belly) obesity, elevated blood pressure, raised triglycerides, low HDL cholesterol, and elevated fasting blood glucose. The authors concluded that eating fast is likely a genuine risk factor, and that slowing down may help manage the condition.

The link with diabetes is especially striking. In a prospective study of 197,825 initially diabetes-free adults followed for three years, published in Scientific Reports in 2019, self-described fast eaters were significantly more likely to develop new-onset diabetes (odds ratio 1.26), and the effect held even after accounting for body weight, blood pressure, smoking, and alcohol. Wolfing food down sends a rapid flood of glucose into your bloodstream, which over time can strain the body’s ability to keep blood sugar in check. None of this means a single hurried lunch will harm you, but it’s a strong argument for making a slower pace your everyday default.