13 diet 'truths' that are doing more harm than good

breakfast woman eating croissant juice
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Eating healthy is hard work, so it's no surprise that many of us have tried a shortcut or two at some point, hoping for speedy results.

But some of these alleged nutritional quick-fixes aren't all that useful, and a handful of them can even be dangerous.

Here's a look at the most insidious food and nutrition myths, along with the science that debunks them.

Myth: You should never 'cheat' on a diet.

Myth: You should never 'cheat' on a diet.

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Truth: It's perfectly fine to go off your healthy eating plan every once in a while, Nichola Whitehead, a registered dietitian and nutritionist with a practice in the UK, tells Business Insider.

"It’s alright to overeat occasionally," says Whitehead. "It’s overeating consistently day in and day out over the long term that causes weight gain."

If you've managed to switch from a diet heavy in red meat and processed carbohydrates to eating mostly vegetables, whole grains, and lean proteins, you've already done the majority of the work, Whitehead says.

Myth: Counting calories is the best way to lose weight.

Myth: Counting calories is the best way to lose weight.

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Truth: Although counting calories can be a useful tool in a bigger toolkit for weight loss, it is not a perfect solution for healthy eating, especially when it's used in isolation.

That's because restricting calories doesn't take into account all the aspects of a food that are required to fuel your body, from protein and carbohydrates to vitamins and minerals. Whitehead summarizes the problem this way: "While calories are important when it comes to losing, maintaining, or gaining weight, they are not the sole thing we should be focusing on when it comes to improving our health."

Myth: Eating low-fat food will make you lose fat.

Myth: Eating low-fat food will make you lose fat.
Your avocado toast misses you.

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Truth: A low-fat diet doesn't necessarily translate into weight loss.

In an eight-year trial involving almost 50,000 women, roughly half the participants went on a low-fat diet, while the others did not. The researchers found that the women on the low-fat plan didn't lower their risk of breast cancer, colorectal cancer, or heart disease. Plus, they didn't lose much weight, if any. New recommendations show that healthy fats, like those from nuts, fish, and avocados, are actually good for you in moderation. So add them back into your diet if you haven't already.

Myth: Cleanses and detoxes are a good way to jump-start a diet.

Myth: Cleanses and detoxes are a good way to jump-start a diet.

Saaleha Bamjee/Flickr

Truth: No one needs to detox.

Unless you've been poisoned, you have a built-in, super-efficient system for filtering out most of the harmful substances you eat. It's made up of two toxin-bashing organs: the liver and the kidneys. Our kidneys filter our blood and remove any waste from our diet, and our livers process medications and detoxify any chemicals we ingest. Paired together, these organs make our bodies natural cleansing powerhouses. Juice cleanse? No thanks.

Myth: Adding a supplement to your weight-loss plan is a good idea.

Myth: Adding a supplement to your weight-loss plan is...

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