When Diets Go Sideways: How Keto, Carnivore, and Other Trends Drift from Their Original Purpose
When Diets Go Sideways: How Keto, Carnivore, and Other Trends Drift from Their Original Purpose
This month, I am taking a closer look at diets. Not the latest social media trends or quick-fix promises, but the broader concept of dietary patterns and how they influence health.
The word “diet” often suggests restrictions, weight loss, and rules about what you can and cannot eat. A diet is simply the pattern of foods and beverages a person regularly consumes. Some diets are designed to support health conditions, some are rooted in cultural traditions, and others are promoted for weight loss or wellness.
Throughout this series, I’ll address what a diet really is, what makes some eating patterns beneficial, why some diets become distorted over time, and how to separate evidence-based nutrition from marketing hype. The goal is not to tell you which diet to follow. Instead, it’s to help you better understand the many ways people eat and how to evaluate dietary advice through a practical, real-world lens.
One of the most interesting things about nutrition is that many popular diets did not start as weight-loss plans and were never really intended to be.
In fact, several dietary approaches that dominate social media today were originally developed for very different purposes.
Some began as medical therapies. Others were designed as short-term diagnostic tools. Still others were created as temporary interventions to help identify health concerns or improve specific outcomes.
Diet Trend FAQ
Was the ketogenic diet originally created for weight loss?
No. The ketogenic diet was originally developed as a medical therapy to help manage epilepsy, particularly in children with difficult-to-control seizures.
What is an elimination diet used for?
An elimination diet is a short-term diagnostic tool used to help identify potential food allergies, intolerances, or other food-related triggers.
Is Whole30 meant to be a long-term diet?
No. Whole30 was designed as a temporary elimination-and-reintroduction program, not a lifelong eating plan.
What are the concerns with the carnivore diet?
The carnivore diet eliminates entire categories of foods, including fruits, vegetables, legumes, and whole grains. This may make it more difficult to obtain certain nutrients, fiber, and the variety found in many evidence-based eating patterns.
Over time, many of these approaches became something else entirely.
They are co-opted, rebranded, simplified, marketed, and promoted as solutions for weight loss, wellness, longevity, or virtually every imaginable health condition.
That does not mean they are always ineffective. It simply means that their original purpose is often very different from how they are discussed and used today.
Here are some examples.
The Medical Ketogenic Diet Versus Modern Keto
Perhaps no diet illustrates this phenomenon better than the ketogenic diet.
The ketogenic diet was originally developed as a medical treatment for epilepsy, particularly in children whose seizures did not respond well to medication.
The classic medical ketogenic diet is highly structured and carefully monitored. It typically contains a very specific ratio of fat, protein, and carbohydrate. Medical professionals oversee the process, monitor nutritional status, and adjust as needed. And, it isn’t a high-protein diet, but a high-fat diet.
The goal was never weight loss.
The goal was seizure management.
Fast forward several decades, and “keto” has become one of the most recognizable diet trends in the world.
Modern keto is often promoted as a weight loss strategy, and many people do lose weight initially. Part of that weight loss can be attributed to calorie reduction, changes in food choices, and early fluid losses that occur when carbohydrate intake is significantly reduced.
What often gets lost is that the popular version of keto is quite different from the medical ketogenic diet that inspired it.
The original purpose was therapeutic. Weight loss was not the focus.
When speaking with people, it seems that most are following some variation of a high-protein, not a high-fat, ketogenic diet. And it can have carbs above the required threshold, so people can’t stay in ketosis.
It takes days to get into ketosis, and just a few grams of carbs above the ketosis threshold can take some out of it in moments. I’ve had people tell me that they “eat keto” a couple of days out of the week. And this just isn’t how the ketosis works.
Elimination Diets Were Never Meant to Be Forever
Elimination diets are another example of a useful tool becoming something very different.
These diets are often used when healthcare professionals suspect a food allergy, food intolerance, or other adverse reaction to specific foods.
The purpose is straightforward.
Potential trigger foods are temporarily removed, symptoms are monitored, and foods are gradually reintroduced to identify possible causes.
Years ago, when I was in high school, I experienced recurring hives. The recommendation at the time was an elimination diet.
When I say elimination diet, I mean elimination diet.
For a time, I ate only four foods. The same four foods for breakfast, lunch, and dinner. Every few days, a new food would be introduced and monitored.
As you can imagine, I lost weight. Quite a bit of weight, actually.
The important point is that weight loss was never the goal.
I weighed around 110 to 112 pounds at the time and certainly did not need to lose weight.
The purpose was to identify whether a food was contributing to the hives.
Ironically, the hives eventually disappeared, but we never identified a specific food culprit. After a few weeks, the diet ended, and normal eating resumed.
That experience highlights an important point.
Elimination diets are diagnostic tools.
They are not intended to be lifelong eating patterns. They are not designed to be weight loss programs. They are structured, temporary interventions designed to answer a specific question.
Yet today, elimination diets are often promoted online as long-term wellness plans.
Whole30: Temporary by Design
Whole30 is another example worth mentioning.
To its credit, Whole30 was always intended to be temporary.
The program involves eliminating multiple foods and food groups for 30 days and then systematically reintroducing them.
The stated goal is to help people evaluate how certain foods affect them.
The challenge arises when people begin treating a temporary elimination protocol as a permanent lifestyle.
For some individuals, this can create unnecessary restrictions and anxiety around food.
A short-term experiment is different from a lifelong eating pattern.
The Rise of Carnivore
The carnivore diet is one of the more recent dietary trends gaining momentum on social media. And has reached cult-like status.
Unlike keto, carnivore was not developed as a medical therapy.
The carnivore diet eliminates virtually all plant foods and focuses almost exclusively on animal products.
Advocates often claim benefits ranging from weight loss to improved digestion to reduced inflammation.
The challenge is that long-term research on strict carnivore diets is extremely limited.
What we do know is that fruits, vegetables, whole grains, legumes, nuts, and seeds consistently appear in dietary patterns associated with positive health outcomes.
When an eating pattern removes entire categories of nutrient-rich foods, it raises legitimate questions about long-term nutritional adequacy and sustainability.
Social Media Loves Simple Answers
One reason these diets gain traction is that social media rewards simplicity.
“Eat this.”
“Don’t eat that.”
“Remove one food group and solve all your problems.”
These messages are easy to communicate and easy to market.
Real nutrition is usually more nuanced.
Health outcomes are influenced by many factors, including genetics, lifestyle habits, sleep, stress, physical activity, medical conditions, and overall dietary patterns.
Most health concerns cannot be traced to a single food or nutrient.
Unfortunately, this detail rarely goes viral.
When Diets Become Identities
Another shift that often occurs is that diets move beyond eating patterns and become personal identities.
People stop saying, “I’m trying a ketogenic diet.”
Instead, they say, “I am keto.”
The same thing can happen with other eating patterns.
When diets become part of personal identity, it can become more difficult to objectively evaluate whether the approach is still serving its intended purpose.
This shifts things from nutrition to ideology. Or like I mentioned – cult-like status.
That is rarely helpful.
What Can We Learn From This?
The fact that a diet was originally developed for a medical purpose does not automatically make it appropriate for everyone.
Likewise, the fact that someone loses weight on a particular diet does not mean the diet is inherently superior. Or even healthy – as evidenced by that elimination diet I was on in high school.
Many dietary approaches can produce short-term weight loss.
The more important questions are:
Is it nutritionally adequate?
Is it sustainable?
Does it fit your lifestyle?
Is there evidence supporting long-term use?
Does it help you meet your health goals?
These are often more useful questions than asking whether a diet is currently trending online.
Key Takeaways
Many popular diets began with a legitimate purpose.
The ketogenic diet was developed to help manage seizures.
Elimination diets were designed to identify food triggers.
Programs such as Whole30 were intended as short-term experiments.
Over time, these approaches have often been repackaged or promoted online as solutions for weight loss or general wellness.
Sometimes the original purpose gets lost along the way.
Understanding where a diet came from and what it was designed to do can help us evaluate whether it makes sense for our own situation.
In the next article in this series, I’ll look at diets that are designed for specific medical conditions and health concerns, including gluten-free, heart-healthy, diabetic, and other therapeutic dietary approaches.
Read More In This Series:
What Is a Diet, Really? Why We’ve Misunderstood the Word “Diet”
What Makes a Diet “Good”? Common Traits of Healthy Eating Patterns
The Best Diets: DASH, MIND, Flexitarian, Mediterranean, and Why They Consistently Rank Well
Fresh Fruits and Vegetables: Why Eating More Produce Is Still Great Advice
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