Despite advancements in nutrition research, many people are still clinging to old, outdated ideas. Are you one of them? Here are 10 nutrition myths that have been debunked by science!
When it comes to nutrition, false or misleading information seems to be everywhere. Start a conversation with a stranger—or even a loved one—and you’ll hear how eating fat makes you fat. Too much protein, of course, will kill you deader than a ribeye. And yes, egg yolks are the devil.
The worst part? There are still plenty of nutrition “experts” making these claims, even in mainstream media where millions take their word as gospel! For this reason, it can be extremely difficult to determine what’s accurate and what’s nothing more than a bunch of gibberish.
Let’s take a look at 10 common nutrition myths and uncover the truth!
Myth 1. Your Body Can’t Utilize More Than 30 Grams Of Protein
People have claimed for years that the human body can only digest 30 grams of protein—or roughly 5 ounces of chicken—per meal. Anything over that will end up being stored as fat or just wasted. Can this really be true?
To understand how this seemingly arbitrary limit became the rule, it helps to go back to where it started. Years ago, it was shown that maximal muscle protein synthesis (MPS) occurred with roughly 20-30 grams of protein. Increasing that amount to 40-plus grams of protein per meal was shown to be no more beneficial for protein synthesis. So does this mean your body stores the excess protein as fat? Not so fast!
Yes, excess amino acids can theoretically be converted into glucose—and ultimately be stored as fat in the body—but this is a long and costly process for the body. It’s highly unlikely you’ll get fat from excess protein. In fact, explorers who ate almost nothing but protein found themselves starving to death from a condition known as “rabbit starvation,” not getting bigger! So let’s go ahead and cross that one off the list.
The take-home lesson: If you want to maximize muscle growth and recovery, you need to both minimize muscle breakdown and increase protein synthesis. I’m not saying you need to eat 70 grams of protein at each meal, but your body can certainly utilize more than 30 grams of protein at one time!
Myth 2. A High-Protein Diet Increases Your Risk Of Osteoporosis
It’s commonly said that a high-protein diet can contribute to osteoporosis, a loss in bone mineral density. The theory behind this states that a high-protein diet increases the acid in your body, causing calcium to get leached out of your bones to neutralize the acid. Sure, why not?
Fortunately, long-term studies examining the effects of protein intake and bone loss don’t support these claims. In fact, in one nine-week study, in which carbohydrates were replaced with meat (increasing daily protein intake dramatically), hormones known to promote bone health, such as IGF-1, actually increased
Myth 3. A High-Protein Diet Puts Stress On Your Kidneys
Your kidneys are incredibly efficient at filtering unneeded substances from your body. And as far as we currently know, consuming a high-protein diet doesn’t increase the strain on your kidneys. The kidneys are built to handle exactly this sort of stress!
To give you an example, one-fifth of the blood pumped by your heart gets filtered by your kidneys every minute or two. Adding a little extra protein may cause a slight increase in the workload, but it’s really just a drop in the bucket compared to the total amount of work your kidneys already do.
Myth 4. Cooking Protein Changes Its Biological Value
Thank goodness this one doesn’t have any truth to it. Otherwise, you’d see lifter after lifter downing raw burger patties post-workout. Thankfully, you can cook your protein and still reap all the benefits of it.
You can’t cook the protein out of your meats; a well-done burger has just as much protein as a rare steak. Eating your meat raw will most likely just increase your risk of food poisoning.
Myth 5. You Must Consume Protein Immediately After A Workout
Forget to consume 30 grams of protein immediately following your last set of curls? Well, you can say goodbye to your gains! It sounds like a joke, but I can’t even begin to tell you how many times I’ve heard that thought expressed in the gym.
The so-called “anabolic window” is a period of time after your training when your body is most primed to accept nutrients—specifically carbs and protein—and deliver them to your muscles to help with repair and recovery. While it was once thought this window was only open for 30-60 minutes post-workout, we now know that it exists for a much longer period of time. In fact, it extends several hours after you finish your training session.
Myth 6. Carbs At Night Will Make You Fat
This sounds reasonable at first glance. Most of us are less active in the later hours of the day, and unless you’re an avid sleepwalker, you’re probably not getting much physical activity while you sleep. Therefore, any carbs you chow down on past 6 p.m. are likely to be stored as fat, because your metabolism slows down and insulin sensitivity is reduced.
But the reality is that your resting metabolic rate isn’t much different when you sleep than it is during the day.[8,9] Exercising during the day can increase your sleeping metabolic rate significantly, however, leading to greater fat oxidation while you dream about 22-inch biceps
Myth 7. A Carb Is A Carb Is A Carb
While all carbs do have about 4 calories per gram, that’s pretty much where the similarities end, at least in regard to how your body breaks them down and digests them.
For example, high-glycemic carbs are fast digesting, meaning they get broken down rather quickly by your body. This creates a rapid surge of glucose into your blood followed by a spike in insulin levels. Simple carbs can leave you feeling pretty sluggish about 45 minutes after you finish eating them, but they’re great to have right after a workout, when your body needs to be refueled. Examples of these include baked goods, fruit juice, candy, most cereals, and anything made with white flour.
Myth 8. Calories From Fiber Don’t Count
Most of us are probably familiar by now with the term “net carbs.” It was popularized by food companies during the Atkins craze to describe the total amount of carbs in a food after the quantity of fiber and sugar alcohols have been removed. The concept behind this is that not all carbs are equal in the way they affect the body (see Myth 5). Fiber and sugar alcohols are thought to have a minimal impact on blood sugar levels and are therefore subtracted from the total number of carbohydrates.
But there is one thing that sugar alcohols and fiber still contribute to: your overall calorie count! My guess is that if you’re trying to minimize your carb intake, your goal is to lose weight. Unfortunately, counting net carbs and excluding the rest is going to give you an inaccurate total, and perhaps impact your results.
Most things in life don’t come free, and this includes carbs. For best results, count all carbs toward your daily intake. And if you’re going to consider anything “free,” don’t choose something that comes with a nutrition label. Make it a leafy green vegetable!
Myth 9. Egg Yolks Will Give You A Heart Attack
Those poor egg yolks have been getting a bum rap for decades. They’ve been targeted for increasing cholesterol levels, promoting heart disease, and wreaking havoc on your waistline.
Why all the hate? Years ago, researchers identified a correlation between dietary cholesterol from sources like egg yolks and elevated blood cholesterol levels. Elevated cholesterol levels can lead to hypertension and cardiovascular disease, thus the cultural ban on egg yolks and the start of the “egg white only” movement.
Myth 10. Eating Fat Makes You Fat
This one seems somewhat logical. The more fat we eat, the more fat we store on our body. It’s the same word, right?
The reality is that fat is not the enemy—our overconsumption of calories in general is. Sure, eating a lot of fat-laden foods like fried foods, burgers, and deep-dish pizza can be one cause for your ever-expanding waistline, but so can chowing down on potatoes, Sour Patch Kids, and bagels, all of which have almost zero fat.