Nutrition

What Is The Best Diet? We Compare Some Of The Most Popular Diets

Every other day you’ll come across a new article telling you the best diet to follow. However, most of the time these articles don’t compare any alternative diet options. We’re here to compare some of the most popular diets from recent times and help you come to a conclusion on what truly is the best diet for you based on your goals and lifestyle.

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Vegan or Vegetarian Diet

The main premise of a vegan or vegetarian diet is limiting your intake of animal-based foods, which are replaced by more servings of plant-based foods. 

Focusing on plant-based foods means a wealth of vitamins and minerals, but can be tricky to meet your protein goals without proper meal planning. 

Vegan diets avoid all animal products while vegetarian diets usually include dairy or eggs.

Pros of the Vegan Diet

  • Many fruits, vegetables, and whole grains 
  • No limit on carbs, sugars, or other foods 
  • Eco-friendly 

Cons of the Vegan Diet

  • Can be more challenging to hit high protein goals 
  • Cost of fresh produce may be a factor for some 

Vegan and vegetarian diets have been around in many cultures for centuries and can meet all health-related needs. They’re not designed for weight loss or muscle gain, but can fit any macro goals or patterns with some planning ahead.

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The Carnivore Diet

The polar opposite of the vegan diet is the carnivore diet, which focuses on primarily animal-based foods. This diet is appealing to those who prefer eating lots of meat and other animal proteins, and those who prefer to follow a low carb or keto diet option. Although it does limit 

Pros of the Carnivore Diet

  • Very high in protein 
  • Can be very low in carbs 
  • Can help burn body fat 

Cons of the Carnivore Diet

  • High consumption of meats may hinder absorption of other nutrients 
  • Can be difficult to sustain long term 
  • Excludes entire food groups 

While the carnivore diet can help you meet your weight loss or muscle gain goals if you adhere strictly to it, it can be difficult to keep your body in a fat burning state due to the low levels of carbs it requires. This diet might be a good fit short term but unsustainable for the long run and makes it difficult to get adequate vitamins and minerals as it limits fruit and veg. 

 

The Alkaline Diet

The Alkaline diet is based on consuming foods that shift your body away from an acidic state and focus on an alkaline state, under the premise of preventing potential ailments caused by acidic conditions within the body.

Pros of the Alkaline Diet

  • Potential to reduce inflammation 
  • Preserving bone health 
  • Presumed less taxing on the organs1 

Cons of the Alkaline Diet

  • Complicated lists of foods to include and avoid 
  • Excludes entire categories of foods (i.e., citrus) 
  • May not be sustainable long term 

While it’s important to help your body maintain a healthy pH balance, a healthy individual typically should be able to consume a variety of nutritious foods without worrying too much about their acidity. 

If you have a healthy digestive system, liver, and kidneys, they are excellent filters that can maintain our body’s ideal state without exclusively consuming alkaline foods. 

Essentially, unless your doctor advises you otherwise, there is no real need for the alkaline diet.

 

The Mediterranean Diet

The Mediterranean diet is a popular diet around the world for many reasons. It focuses on highly nutritious foods like vegetables, healthy fats, and unprocessed foods. It can be adapted for weight loss or maintenance and can fit into any calorie or macro plan – but can also be achieved without counting.

Pros of the Mediterranean Diet

  • Easy to follow 
  • Allows for all food groups 
  • May support heart health and reduce inflammation2 
  • Can be used for weight loss 

Cons of the Mediterranean Diet

  • Excludes many convenient (processed) foods 
  • Fresh foods may be more costly

The Mediterranean Diet is an easy to follow and delicious meal plan that can be adapted for many goals. This diet is best for anyone who enjoys a variety of nutritious foods.

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If It Fits Your Macros Diet

The IIFYM (if it fits your macros) diet is best for anyone who is dedicated to achieving their goals. Whether weight loss, muscle gain, or something in between, tracking your macros gives you control over performance and physical goals.

Pros of the IIFYM Diet

  • Can be very regimented (may also be a con if you don’t like to be regimented) 
  • Can help build muscle 
  • Can help lose weight 
  • No foods are completely excluded 

Cons of the IIFYM Diet

  • Requires lots of math and tracking 
  • May be time consuming 
  • May need adjustments over time 

While IIFYM takes some time to learn, it can be a sustainable diet pattern and is easily manipulated to help you meet your goals even when your goals change over time. Similar to tracking your calories, any foods can fit into this diet pattern and that makes it easier to adhere to long term.

 

The Smoothie Diet

The smoothie diet is designed to help you lose weight easily and get balanced nutrition by replacing two meals per day with smoothies for 21 days, then gradually re-introducing other healthy foods. 

It can be easy to follow due to its short duration and can help achieve weight loss goals if you follow it properly. 

Pros of the Smoothie Diet

  • Easy to follow (if you have the meal plan) 
  • High in nutrients 
  • Short term 

Cons of the Smoothie Diet

  • Replaces two regular meals each day 
  • Can feel restrictive 
  • Effects can be short term or unsustainable 

While the Smoothie Diet is an effective way to manage your calorie intake and therefore lose weight, you don’t actually learn healthy meal planning and balanced eating by only consuming smoothies. 

Smoothies can be a part of any healthy diet without consuming only smoothies for two meals each day.

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The Blood Type Diet

The Blood Type Diet is based on the idea that our blood types designate the best diet for our bodies. It provides four versions (based on your blood type) that prescribe certain foods. 

While some people like this structure, it’s very detailed and less of a one-size-fits all approach. 

Pros of the Blood Type Diet

  • Tells you exactly what food categories to eat 
  • Most healthy foods are included 
  • Feels “customized” to your body  

Cons of the Blood Type Diet

  • Not supported by scientific evidence3 
  • Excludes some foods based on which version you follow 
  • May not be realistic long term 

With no hard science supporting eating for your blood type, this diet likely is not the best to follow. However, if you like experimenting with different diet patterns, there would be no harm in trying to blood type diet for a short period of time.

 

The Ketogenic Diet

The Ketogenic Diet has become very popular in the last few years because it promises quick weight loss by burning body fat. It’s based on reducing your carb intake so low that your body has to shift to burning fat for energy – ketogenesis. 

While this works, it can be hard to stay in a ketogenic state, and difficult to maintain the weight loss that you originally achieve. 

Pros of the Ketogenic Diet

  • Includes many high fat, tasty foods 
  • Has lots of protein  
  • Relatively easy to follow 

Cons of the Ketogenic Diet

  • Excludes many healthy foods, like fruits and whole grains
  • Requires strict adherence to see results
  • Likely not sustainable long term

While the ketogenic diet can be useful for weight loss if you’re good at sticking to the plan, it may not be a good fit for those who follow vegetarian or vegan diets who rely on healthy carbohydrates for some of their protein.

The ketogenic diet can help you meet your goals if you are determined to stick to it,But there are several other diets that allow you to eat carbohydrates (that have extremely important benefits) that may be a better, more sustainable fit.

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The 16:8 Intermittent Fasting Diet

The premise of intermittent fasting relies on giving your body a break from digestion and absorption to help regulate hormone levels and lose fat mass. If this 16:8 diet, you “fast” (or don’t consume calories) for 16 hours and only eat during an 8-hour window.

Pros of the 16:8 Diet 

  • Can promote weight loss5 
  • Can promote lean gains5 
  • Can feel unrestrictive during eating window 

Cons of the 16:8 Diet

  • Strict eating/fasting schedule 
  • May be difficult to fuel properly for workouts 
  • Can be as effective as calorie restriction 

The 16:8 IF diet can be effective purely by not eating for most of the day – which limits overall calorie intake. However, you can still go overboard during the 8-hour eating window and not see any results. If you track your calories, this diet can work – but may also not be necessary.  

 

The 5:2 Diet

The 5:2 Diet is another form of intermittent fasting that prescribes two very low calorie “fasting” days and 5 moderate calorie regular eating days. The premise is to only restrict your intake drastically two days a week, making it feel more sustainable. 

Pros of the 5:2 Diet

  • Most days are less restrictive 
  • No foods are totally off limits 
  • Can be effective for weight loss or lean gains 

Cons of the 5:2 Diet

  • Likely as effective is regular calorie restriction or macro counting 
  • Very low-calorie intake on fasting days can impact performance in the gym 
  • May be difficult to follow long term 

While the 5:2 diet is effective for some, it is likely due to the negative calorie balance you achieve through two days of fasting.6 In the long run, a healthy diet pattern can be just as effective without two days of extreme restriction. 

 

So What is the Best Diet?

The best diet is a highly individual decision, but there are a few fundamentals for consideration. If your goals are fat loss or muscle goal, IIFYM can give you the control over your eating patterns to meet your goals. Other diets may only be short term trends that may or may not give you sustainable results. 

Research consistently shows that counting calories (or macros) is effective, whether you are limiting carbs or fat to meet those goals.7
 

Take Home Message

The best diet is one that you can stick with long term and fit into your lifestyle. Be wary of any diets that promise instant results or restrict many foods for a long time. Health can be achieved through many diet patterns.7

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Our articles should be used for informational and educational purposes only and are not intended to be taken as medical advice. If you’re concerned, consult a health professional before taking dietary supplements or introducing any major changes to your diet.


  1. 1.Passey, C. (2017). Reducing the dietary acid load: how a more alkaline diet benefits patients with chronic kidney disease. Journal of Renal Nutrition27(3), 151-160. 
  2. Martínez-González, M. A., Salas-Salvadó, J.,Estruch, R., Corella, D., Fitó, M., Ros, E., & Predimed Investigators. (2015). Benefits of the Mediterranean diet: insights from the PREDIMED study. Progress in cardiovascular diseases58(1), 50-60.  
  3. Wang, J., García-Bailo, B., Nielsen, D. E., & El-Sohemy, A. (2014). ABO genotype,‘blood-type’dietand cardiometabolic risk factors.PloS one9(1), e84749. 
  4. Vining, E. P., Freeman, J. M.,Ballaban-Gil, K., Camfield, C. S., Camfield, P. R., Holmes, G. L., … & Ketogenic Diet Multi-Center Study Group. (1998). Amulticenter study of the efficacy of the ketogenic diet. Archives of neurology55(11), 1433-1437. 
  5. Moro, T., Tinsley, G., Bianco, A.,Marcolin, G., Pacelli, Q. F., Battaglia, G., … & Paoli, A. (2016). Effects of eight weeks of time-restricted feeding (16/8) on basal metabolism, maximal strength, body composition, inflammation, and cardiovascular risk factors in resistance-trained males.Journal of translational medicine14(1), 1-10. 
  6. Johnstone, A. (2015). Fasting for weight loss: an effective strategy or latest dietingtrend?.International Journal of Obesity39(5), 727-733. 
  7. Katz, D. L., & Meller, S. (2014). Can we say what diet is best forhealth?.Annual review of public health35, 83-103. 


Claire Muszalski

Claire Muszalski

Writer and expert

Claire is a Registered Dietitian through the Academy of Nutrition and Dietetics and a board-certified Health and Wellness Coach through the International Consortium for Health and Wellness Coaching. She has a Bachelor of Science in Biology and a Master’s degree in Clinical Dietetics and Nutrition from the University of Pittsburgh.

Talking and writing about food and fitness is at the heart of Claire’s ethos as she loves to use her experience to help others meet their health and wellness goals.

Claire is also a certified indoor cycling instructor and loves the mental and physical boost she gets from regular runs and yoga classes. When she’s not keeping fit herself, she’s cheering on her hometown’s sports teams in Pittsburgh, or cooking for her family in the kitchen.

Find out more about Claire’s experience here.


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