Debunking Common Nutrition Myths

Written By: Alysia Vega, RD, LDN, CPT

Why Nutrition Myths Stick Around (and Why They’re So Hard to Shake)

In a world flooded with wellness influencers, quick fixes, and “miracle” diet claims, it’s no wonder we’ve been misled. Social media has become one of the primary ways people consume nutrition information—and unfortunately, it’s often more about engagement than evidence. From flashy headlines to viral TikTok trends, misinformation spreads fast.

But the confusion runs deeper than algorithms. For decades, the food industry and weight loss market have shaped our beliefs about health through marketing. Every few years, a new villain emerges: fat in the 90s, carbs in the 2000s, now protein is being pushed like it’s the holy grail. These “eras” of nutrition have left many of us confused, anxious, and disconnected from our bodies.

Let’s take a quick look back with nutrition myths vs facts…

Top Nutrition Myths of the Past Few Decades (and the Eras That Fueled Them) 

These myths didn’t come out of nowhere—they were fueled by billion-dollar industries, shifting health trends, and a whole lot of marketing:

1. Myth: Fat isn’t needed in our diet.

Welcome to the 80s and 90s: the “fat-free” everything era. Low-fat cookies, low-fat yogurt, low-fat salad dressing… all while loading up on sugar and additives. Turns out, fat is crucial for hormone health, brain function, and satisfaction.

Instead of labeling fats as “good” or “bad,” we can take a neutral approach and appreciate their role in flavor, satisfaction, and overall nourishment. Whether it’s avocado on toast, olive oil in a salad, or peanut butter on your morning oatmeal, fat helps make food enjoyable and filling. The key isn’t elimination—it’s allowing space for all types of food in a way that supports both physical and emotional well-being.

2. Myth: Carbohydrates are “bad”.

The late 90s and early 2000s ushered in the Atkins, South Beach, and Zone craze. Later came keto and paleo, pushing people to fear carbs even more.

But, let’s be real, carbohydrates (aka carbs) are severely misunderstood and underappreciated. Despite the fear-mongering around carbs, they are actually our body’s preferred source of energy (yes, you read that right), fueling everything from brain function to muscle movement. Carbs play a crucial role in stabilizing blood sugar and supporting digestion (hello, fiber!).

When we don’t eat enough carbohydrates, our bodies compensate by breaking down muscle for energy, leading to fatigue, brain fog, and hormonal imbalances. Restricting carbs can also trigger intense cravings and binge-restrict cycles, which is why sustainable, balanced nutrition includes them as an essential part of the diet. Instead of fearing carbs, let’s focus on honoring our body’s needs with a variety of nourishing carbohydrate sources like fruits, vegetables, whole grains, and legumes. Science—and our bodies—support a diet that includes all macronutrients, carbs included.

3. Myth: Detoxes are important for cleansing your body.

Enter the era of green juices, skinny teas, and charcoal lemonades. But the truth? Your body already has a built-in detox system: your liver and kidneys. These organs work 24/7 to filter out toxins and waste, keeping you healthy without the need for restrictive cleanses.

Many detox programs severely limit calories, leading to low energy, muscle loss, and even slowed metabolism. Instead of spending money on a cleanse, focus on nourishing your body with fiber-rich foods, hydration, and balanced meals that naturally support your body’s detoxification processes.

4. Myth: The more protein the better.

Right now we’re living in the protein-obsessed era. Protein is essential, but more doesn’t always mean better. While protein supports muscle repair, immune function and even plays a role in our genetic processes, eating more than your body needs doesn’t automatically translate to “better health” or “faster results”.

Overconsumption of protein can put extra strain on the kidneys and may displace other essential nutrients from your diet. A balanced intake from whole food sources like beans, lentils, eggs, dairy, poultry, and fish ensures you’re meeting your needs without unnecessary excess.

So… How Do You Know What to Trust?

With so much noise online, it’s easy to feel overwhelmed or even defeated. It’s no secret that social media plays a massive role in shaping our views on food and health (anyone else watch the Apple Cider Vinegar series on Netflix?). But with information overload comes confusion, anxiety, and misinformation. Research shows that social media overload triggers social media fatigue, which can lead to the development of anxiety and diminished health self-efficacy.

Many viral health trends lack evidence-based dietary guidelines, instead relying on anecdotal claims or influencer endorsements. When it comes to nutrition, trust science, not trends. But you don’t need a PhD to spot bad advice. Here are three simple questions to ask:

1. Who is sharing this information? Are they a qualified professional (e.g., registered dietitian, researcher), or are they selling a product?
2. Is there scientific evidence to support it? Are claims backed by reputable studies, or is it just personal testimony?
3. Does it promote balance? Extreme approaches—whether cutting out food groups or promising unrealistic results—are not sustainable or necessary.

The Bottom Line: Trust Science, Not Trends

The best nutrition advice isn’t about chasing fads—it’s about creating a sustainable, balanced relationship with food, and grounded in science. Breaking food rules and unlearning popular diet myths can be tough, but your body deserves nourishment without fear or restriction.

Our dietitians at Karuna are committed to helping you navigate the overwhelming world of nutrition with evidence-based, compassionate, and personalized guidance. Let’s continue to challenge nutrition myths vs facts, advocate for science-based nutrition advice, and make informed choices rooted in care, not fear. Book a session with our dietitians at Karuna today to build a balanced, stress-free relationship with food.

References: 

1.https://vetmed.tamu.edu/peer/detoxification/

2.https://pmc.ncbi.nlm.nih.gov/articles/PMC10757012/

3.https://pmc.ncbi.nlm.nih.gov/articles/PMC7460905/#:~:text=High%20dietary%20protein%20intake%20can,a%20role%20in%20kidney%20health.  

4.https://pmc.ncbi.nlm.nih.gov/articles/PMC9398050/#:~:text=Cognitive%20restraint%20is%20the%20process,usually%20seen%20among%20university%20students.