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The 8 Best Diets for Sustainable Weight Loss

Written by Melissa Mitri, MS, RD

Reviewed by Ana Reisdorf, MS, RD 

Published on June 17, 2021

Want to lose weight? There are 100s of possible diets out there you can follow, but which ones are sustainable long-term?

The 8 Best Diets for Sustainable Weight Loss

If you’ve ever followed a weight loss plan, you’ve probably noticed that the hardest part is keeping the weight off.

If you are tired of your weight loss slowing down after a few months or the fact that it creeps back up once you quit the diet, you’re not alone.

Many popular weight loss plans are designed to produce quick weight loss results but set you up for failure in the long term.

What typically happens with any new way of eating is an initial rapid weight loss that is very motivating. But after those first few months, the weight loss commonly stops.

This can leave you wondering what you’re doing wrong. It also can be frustrating when you feel like you’re starting to regain the weight back that you worked so hard to lose.

But there is good news. Research shows that approximately 20% of the population is successful at long-term weight loss maintenance, defined as losing at least 10% of their body weight for at least a year.

For sustainable weight loss, both diet and exercise are important. However, your diet patterns play an even larger role in your success.

With so many diet programs claiming to be the solution, how do you pick the best diet for you?

While there is no one perfect diet for everyone, certain eating patterns have been shown to increase the likelihood of long-term weight loss.

When it comes to the best long-term diet, practicing these eating patterns, rather than a strict diet, is most effective.

Here we break down the top 8 diet patterns for sustainable weight loss.

1. Mediterranean Diet

The Mediterranean diet is based on foods from the Mediterranean regions of Europe.

This healthy eating plan is designed to reduce the risk of heart disease and other chronic diseases and was not originally intended to produce weight loss.

However, a 2011 meta-analysis showed that it could also be an effective weight loss plan.

The Mediterranean diet is based primarily on plant-based foods, such as fruits, vegetables, beans, nuts, legumes, whole grains, fish, seafood, and extra-virgin olive oil. Red meat and dairy are used sparingly.

Many of the foods eaten regularly on this diet are highly nutritious. They are also anti-inflammatory, high in fiber, and low in saturated fat.

Fiber increases satiety, which can aid in weight loss. In fact, studies show that fiber intake is associated with lower body weight.

This makes sense because if you feel satiated with your meals, you will be less likely to overeat and veer off track with your habits.

This diet plan also limits high-fat meats and dairy, which are high in calories and may increase inflammation in the body.

Chronic inflammation may increase the risk of several diseases such as diabetes or cardiovascular disease, which may make it more difficult to lose weight.

While this is probably one of the best diets to lose weight, practicing portion control is still needed.

Paying attention to the number of calories you are consuming will help ensure you match your own individual needs.

The Mediterranean diet is a good choice for anyone who wants to lose weight and improve their nutritional intake.

Learn More: Mediterranean Diet: A Detailed Beginner’s Guide

2. DASH Diet

The DASH diet stands for “Dietary Approaches to Stop Hypertension.”

This diet plan was originally designed to help treat or prevent high blood pressure, otherwise known as hypertension.

However, due to several components of the diet, it also has been seen to aid in weight loss.

A 2016 randomized controlled trial found that those who followed a DASH diet for 8 weeks saw greater improvements in both weight and BMI.

The diet emphasizes foods that are naturally lower in sodium, such as fruits, vegetables, whole grains, and lean meats.

It is designed to be lower in salt, red meat, processed foods, added sugar, and saturated fat.

Too much sodium, or salt, in the diet can increase the risk for obesity. Studies have shown that higher consumption of salt in the diet is associated with weight gain. The reason for this is likely twofold.

First, foods high in sodium tend to be higher in calories and more processed, and sodium itself can cause fluid retention, making it harder to lose weight.

If you’ve ever found yourself gaining weight in a short amount of time, it is possible sodium was to blame.

Additionally, eating a lot of high sodium foods, such as takeout or restaurant food, can cause a temporary increase in water weight gain.

Not only is the DASH diet good for overall heart health, but it also is a sustainable weight loss program.

The DASH diet may be best for someone who wants to lose weight but also needs to cut back on their salt intake.

Learn More: DASH Diet: A Complete Beginner’s Guide

3. Mindful Eating

While mindful eating is not a specific diet program, it is a way of eating that can support sustainable weight loss.

Mindful eating is simply eating with awareness. It is a way of eating in which you are paying attention to your body and what it is telling you.

This can help you recognize the signs when you are physically hungry and when you are actually getting full.

You can follow any weight loss plan out there, but if you aren’t able to tune into your body, it won't be easy to lose weight long-term.

This is because once something happens to throw you off course, it will be harder to stay on track towards your goals.

According to a 2018 research review, incorporating mindful eating into any weight loss program provides additional benefits and helps prevent weight regain.

Mindful eating is a good choice for anyone looking to improve their relationship with food and learn the barriers getting in their way.

Learn More: Top 12 Best Diet Habits for Weight Loss According

4. Flexitarian Diet

The flexitarian diet is a way of eating that focuses primarily on plant-based eating. However, it is more flexible than a traditional vegetarian diet because it allows meat from time to time.

This diet was coined by registered dietitian Dawn Jackson-Blatner, who created this way of eating to provide more flexibility for a plant-based lifestyle.

This way of eating encourages a variety of healthy foods that are satisfying. It does not restrict anything completely, which lends to its appeal.

A 2016 research review investigated the benefits of a flexitarian diet in women. They found that those following a flexitarian diet saw a decrease in body weight, metabolic health, blood pressure, and a reduced risk of diabetes.

This diet can therefore be a great weight loss plan for women or for anyone who wants to enjoy all the health benefits of a plant-based diet but have the option to eat meat once in a while.

5. Plant-Based Diet

Plant-based, or vegetarian diets, have multiple benefits to our health. In addition, they have also been seen to be effective for weight loss.

A large 2019 systematic review revealed those following plant-based diets consumed fewer calories and weighed less than those who did not. There are several likely reasons for this.

Vegetarian diets, when followed properly, are highly nutritious and naturally lower in calories. They also tend to be very filling, thanks to the fiber and water content of plant-based foods.

Because plant-based foods are packed with fiber, so they are also hard to overindulge on. This can result in the fewer late afternoon or late-night cravings, and subsequently, less late-night eating.

There are different types of plant-based diets – with some people choosing to eat dairy, fish, or eggs. Vegan diets restrict all animal products.

If you choose to go plant-based, make sure you get adequate protein and vitamins that your body needs.

There are plenty of vegetarian proteins such as beans, lentils, nuts, seeds, tofu, tempeh, and nut butters that can meet your needs.

If you are following a vegan diet, check with your doctor about any supplements that you may need.

A plant-based diet is great for anyone who wants to increase their intake of fruits, vegetables, and whole grains and decrease their intake of animal fats.

Learn More: The Vegetarian Diet: A Detailed Beginner’s Guide and Meal Plan

6. Weight Watchers (WW)

While sometimes considered a “fad” diet, WW members have been more successful in keeping the weight off than most other commercial diet programs.

A 2017 randomized controlled trial showed the potential for WW to produce long-term weight loss in those who remained on the program.

The WW diet plan is also flexible and does not require cutting out any foods.

It instead uses a points system that assigns a value to each food. This system exists so that you can make better decisions with your food choices and actually learn how to eat healthy.

What is particularly helpful about WW is the ongoing support, accountability, and education they provide.

They offer a WW support group, a nutrition coach, a Facebook group, and an app to access different training so you can make the most of your membership.

As a WW lifetime member, you have access to all these resources for life. In this way, accountability doesn’t end.

Accountability is one of the most important factors in providing support for long-term weight loss.

This accountability often bridges the gap between the desire to achieve a goal to actually doing the things you need to do to achieve it.

The WW weight loss diet plan is helpful for someone who likes the structure of a program, with a higher level of accountability.

Learn More: WW (Weight Watchers) Diet: A Comprehensive Review

7. Noom

Noom is an online weight loss program that encourages the consumption of low-calorie, high-volume foods.

This essentially means it promotes foods that are higher in water content and lower in calories by volume, such as fruits and vegetables.

When you sign up for Noom, you are provided with a personalized plan to track your calories.

There is also a big mindful eating component to this diet program, where you are encouraged to track your habits and learn why you eat the way you do.

This mindful eating component helps address any barriers or life stressors that are getting in your way. In this way, you can get to the root of the problem and find a healthier solution.

You are also provided with a support group and Noom coach. Some of the Noom coaches have training in nutrition, and they can help you create a sustainable plan.

The Noom weight loss program is ideal for someone who wants to lose weight and also address the root cause of their weight struggles.

Learn More: Noom Diet: A Detailed Review

8. A Diet You Can Stick With

When it comes down to it, the most effective weight loss plan is one that you can stick with for life.

Having ongoing accountability is also extremely beneficial, whether in the form of a support group, health professional, or trusted friend.

Following a strict diet to lose weight is not sustainable, and so finding a more balanced way of eating is key to long-term success.

Any weight loss diet that restricts certain foods or food groups completely is not realistic over the long term.

It’s human nature to want what we can’t have, and so eventually, these types of diets become difficult for many to follow.

When you are depriving your body of too much, it eventually catches on and leads to your weight creeping back up.

Learn More: 7 Tips for Finding the Best Diet That Works for You

The Bottom Line

With all the popular diet trends out there, it is tempting to be intrigued by the fad diets or overly restrictive diets that may produce quick weight loss, such as keto, Whole 30, or Nutrisystem.

But it’s important to remember that when the weight comes off very quickly, it often comes back on just as quickly.

A diet you can stick with is one you can follow every day, no matter where you are or the circumstances.

Ask yourself if your current way of eating is sustainable long-term, and if the answer is no, there are healthier eating plans out there.

If you are still wondering what the best weight loss plan for you is, seek the guidance of a registered dietitian.

A registered dietitian is an expert in nutrition and can determine the best healthy eating plan that you can happily sustain.

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