Search trends for popular diets spike every January (and every summer). Each promises weight loss, better overall health and a clear eating plan.
Some help people lose weight and lower blood pressure. Others fall into the category of fad diets that fade as fast as they rise.
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Here are 10 major diet trends, how they got popular—and what controlled trials and health experts say about whether they actually work.
This eating pattern emphasizes olive oil, healthy fats, whole grains, fruits vegetables, lean meats, and minimally processed foods. It limits saturated fats, processed meats and added sugars.
Researchers studying heart disease in the mid-20th century noticed lower rates of heart disease in countries bordering the Mediterranean Sea. The Mediterranean diet became widely recommended by health experts and nutrition expert panels.
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Controlled trials link it to lower cholesterol levels, reduced heart disease risk, and better overall health. It is less a strict diet plan and more a sustainable healthy diet.
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This eating plan focuses on fruits and vegetables, low fat dairy products, whole foods and fewer calories from saturated fats.
The DASH diet, short for dietary approaches to stop hypertension, was developed through federally funded research to stop hypertension and lower blood pressure.
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Studies show it can lower blood pressure and support a healthy weight. Among dietary approaches to stop high blood pressure, it remains one of the most evidence-backed.
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Ketogenic diet plans are very low-carbohydrate diets that push the body into ketosis, a state where it burns fat for fuel.
The keto diet exploded on social media as dramatic before and after weight lost stories circulated. Influencers promoted the ketogenic diet as a fast weight loss diet.
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Some people lose weight quickly because they eat fewer calories and shed water weight. However, long-term safety data are limited, and some versions are high in saturated fats and red meat. Many struggle to get enough nutrients from restricted food groups.
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Instead of restricting certain foods, this approach limits when you eat foods.
Intermittent fasting gained traction through podcasts, books, and claims that humans ate this way during the Paleolithic era.
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Some controlled trials show modest weight loss and improved insulin sensitivity. Results often come from consuming fewer calories overall rather than a unique metabolic advantage.
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Like the keto diet, it restricts carbs and encourages higher fat and protein intake.
The Atkins diet became especially popular again in the early 2000s as one of the original low-carbohydrate diets promising rapid weight loss.
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Short-term weight loss can occur, but long-term results often mirror other weight loss diet strategies when calories are matched. High intake of processed meats may increase chronic disease risk.
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This eating pattern removes dairy products, whole grains, and processed foods while emphasizing lean meats, fruits, vegetables, nuts, and seeds.
The paleo diet markets itself on the idea that humans ate whole foods in the paleolithic era before agriculture.
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While it cuts added sugars and processed foods, eliminating certain food groups can make it harder to get enough nutrients without careful planning.
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A vegan diet eliminates all animal products—including honey, dairy products, and red meat—and centers on plan-based foods.
Growing concern about animal welfare, climate change, and health benefits pushed the vegan diet into the mainstream.
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Research links it to lower cholesterol levels and reduced heart disease risk. However, attention to vitamin B12, iron, and protein intake is important for immune system function and overall health.
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By removing meat but often keeping dairy products and eggs, this eating plan can provide flexibility.
The vegetarian diet has deep roots in cultural and religious traditions, but it gained broader popularity through modern health movements.
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When built around whole foods, unsaturated fats and non starchy vegetables, it supports a healthy weight and lower blood pressure.
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Originally designed for people with celiac disease, the gluten-free diet expanded as a new diet trend among people without diagnosed intolerance.
For those with celiac disease, avoiding gluten prevents an immune reaction and intestinal damage. For others, weight loss may happen simply because they cut processed foods and certain foods high in refined grains.
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There is little evidence of added benefit for people without gluten sensitivity.
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This plan removes plant-based foods entirely and focuses on animal products.
The carnivore diet rose from online communities promoting extreme, low-carbohydrate diets and anti-plant arguments.
While some people report short-term weight loss, health experts warn about high cholesterol, limited fiber, and potential health risks tied to saturated fats. Eliminating fruits, vegetables, and whole grains may increase long-term chronic disease risk.
Across all these popular diets, one pattern stands out. Weight gain happens when people consistently consume more calories than they burn. Weight loss happens when they eat fewer calories over time.
The best healthy diet is one that you can maintain, provides enough nutrients, limits processed foods, and supports stable energy.
Before starting a new diet, consider your own health history, any chronic disease, and whether the eating pattern fits your lifestyle. Sustainable changes often outperform diet fads when it comes to lasting weight loss and overall health.
We created this article in conjunction with AI technology, then made sure it was fact-checked and edited by a HowStuffWorks editor.
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