Fasting has become increasingly common.
In fact, intermittent fasting, a dietary pattern that cycles between periods of fasting and eating, is often promoted as a miracle diet.
Yet, not everything you’ve heard about meal frequency and your health is true.
Here are 11 myths about fasting and meal frequency.
One ongoing myth is that breakfast is the most important meal of the day.
People commonly believe that skipping breakfast leads to excessive hunger, cravings, and weight gain.
One 16-week study in 283 adults with overweight and obesity observed no weight difference between those who ate breakfast and those who didn’t (
Thus, breakfast doesn’t largely affect your weight, although there may be some individual variability. Some studies even suggest that people who lose weight over the long term tend to eat breakfast (
What’s more, children and teenagers who eat breakfast tend to perform better at school (3).
As such, it’s important to pay attention to your specifc needs. Breakfast is beneficial for some people, while others can skip it without any negative consequences.
SUMMARY Breakfast can benefit many people, but it’s not essential for your health. Controlled studies do not show any difference in weight loss between those who eat breakfast and those who skip it.
Many people believe that eating more meals increases your metabolic rate, causing your body to burn more calories overall.
Your body indeed expends some calories digesting meals. This is termed the thermic effect of food (TEF) (
On average, TEF uses around 10% of your total calorie intake.
However, what matters is the total number of calories you consume — not how many meals you eat.
Eating six 500-calorie meals has the same effect as eating three 1,000-calorie meals. Given an average TEF of 10%, you’ll burn 300 calories in both cases.
Numerous studies demonstrate that increasing or decreasing meal frequency does not affect total calories burned (
SUMMARY Contrary to popular belief, eating smaller meals more often does not increase your metabolism.
Some people believe that periodic eating helps prevent cravings and excessive hunger.
Yet, the evidence is mixed.
That said, responses may depend on the individual. If frequent eating reduces your cravings, it’s probably a good idea. Still, there’s no evidence that snacking or eating more often reduces hunger for everyone.
SUMMARY There’s no consistent evidence that eating more often reduces overall hunger or calorie intake. Rather, some studies show that smaller, more frequent meals increase hunger.
Some people claim that eating often makes it harder for them to adhere to a healthy diet. However, if you find that eating more often makes it easier for you to eat fewer calories and less junk food, feel free to stick with it.
SUMMARY There’s no evidence that changing your meal frequency helps you lose weight.
Some people claim that if you don’t eat carbs every few hours, your brain will stop functioning.
This is based on the belief that your brain can only use glucose for fuel.
However, your body can easily produce the glucose it needs via a process called gluconeogenesis (
Ketone bodies can feed parts of your brain, reducing its glucose requirement significantly.
However, some people report feeling fatigued or shaky when they don’t eat for a while. If this applies to you, you should consider keeping snacks on hand or eating more frequently.
SUMMARY Your body can produce glucose on its own to fuel your brain, meaning that you don’t need a constant dietary glucose intake.
Some people believe that incessant eating benefits your health.
However, short-term fasting induces a cellular repair process called autophagy, in which your cells use old and dysfunctional proteins for energy (
Some studies even suggest that snacking or eating very often harms your health and raises your risk of disease.
SUMMARY It’s a myth that snacking is inherently good for your health. Instead, fasting from time to time has major health benefits.
One common argument against intermittent fasting is that it puts your body into starvation mode, thus shutting down your metabolism and preventing you from burning fat.
While it’s true that long-term weight loss can reduce the number of calories you burn over time, this happens no matter what weight loss method you use (
There’s no evidence that intermittent fasting causes a greater reduction in calories burned than other weight loss strategies.
In fact, short-term fasts may increase your metabolic rate.
SUMMARY Short-term fasting does not put your body into starvation mode. Instead, your metabolism increases during fasts of up to 48 hours.
Some people claim that you can only digest 30 grams of protein per meal and that you should eat every 2–3 hours to maximize muscle gain.
However, this is not supported by science.
The most important factor for most people is the total amount of protein consumed — not the number of meals it’s spread over.
SUMMARY Your body can easily make use of more than 30 grams of protein per meal. It’s unnecessary to obtain protein every 2–3 hours.
Some people believe that when you fast, your body starts burning muscle for fuel.
Although this happens with dieting in general, no evidence suggests that it occurs more with intermittent fasting than other methods.
On the other hand, studies indicate that intermittent fasting is better for maintaining muscle mass.
Another study showed a modest increase in muscle mass for people who consumed all their calories during one huge meal in the evening (
Notably, intermittent fasting is popular among many bodybuilders, who find that it helps maintain muscle alongside a low body fat percentage.
SUMMARY There’s no evidence that fasting causes more muscle loss than conventional calorie restriction. In fact, studies demonstrate that intermittent fasting may help you maintain muscle mass while dieting.
SUMMARY Although rumors abound that it’s harmful, short-term fasting has powerful benefits for your body and brain.
Some individuals claim that intermittent fasting causes you to overeat during the eating periods.
While it’s true that you may compensate for calories lost during a fast by automatically eating a little more afterward, this compensation isn’t complete.
One study showed that people who fasted for 24 hours only ended up eating about 500 extra calories the next day — far fewer than the 2,400 calories they’d missed during the fast (
Because it reduces overall food intake and insulin levels while boosting metabolism, norepinephrine levels, and human growth hormone (HGH) levels, intermittent fasting makes you lose fat — not gain it (
As such, intermittent fasting may be one of the most powerful tools to lose weight.
SUMMARY Intermittent fasting is an effective weight loss method. Despite claims to the contrary, no evidence suggests intermittent fasting promotes weight gain.
Numerous myths get perpetuated about intermittent fasting and meal frequency.
However, many of these rumors are not true.
For example, eating smaller, more frequent meals does not boost your metabolism or help you lose weight. What’s more, intermittent fasting is far from unhealthy — and may offer numerous benefits.
It’s important to consult sources or do a little research before jumping to conclusions about your metabolism and overall health.