How Effective Is The 80-20 Approach For Weight Loss, Really? (2024)

When you’re on a weight loss journey, you may think you need to overhaul your entire routine and start restricting foods ASAP. However, it’s totally possible to shed pounds while eating delicious meals and focusing on moderation instead of elimination. The secret? The 80/20 rule.

The 80/20 rule, sometimes referred to as the 80/20 diet, involves eating healthy, whole foods for 80 percent of the time and "indulging" 20 percent of the time. The "80/20" ratio has also been used to call out that weight loss is 80 percent eating well and 20 percent exercising, but for now, we're focusing on how an 80/20 rule shakes out as a diet.

Like many popular diet plans, the 80/20 rule will work for some people but not others—and if you’re considering trying it, there are certain advantages and disadvantages to be aware of. Ahead, weight loss experts break down everything you need to know about the 80/20 rule, including the pros, cons, a suggested food list, and practical tips for following the plan.

Meet the experts: Matthew Weiner, MD, is a bariatric surgeon at Pound of Cure Weight Loss. Amy Elizabeth Rothberg, MD, is director of the weight management clinic at Michigan Medicine.

What is the 80/20 rule?

The 80/20 rule typically refers to eating nutritious foods 80 percent of the time, then eating more freely the other 20 percent of the time. Unlike a restrictive diet plan, the 80/20 rule focuses on moderation—you're able to enjoy foods you love, but encouraged to have a higher ratio of healthy, whole foods and treats in moderation. This approach can be helpful whether you want to eat a more balanced diet or if you want to lose weight.

The critical part of the plan is determining what foods fall into each category, says Matthew Weiner, MD, a bariatric surgeon at Pound of Cure Weight Loss. It’s important to measure how much of your diet includes fruit, vegetables, nuts, seeds, and beans, along with not-so-healthy options, like foods full of refined sugar, refined grains, cheese, and other high-fat animal proteins, he says. The exact foods you eat on the 80/20 diet are entirely up to you, and your specific meal plan will likely depend on individual calorie needs, weight loss goals, and how certain foods make you feel.

In some cases, you may want to move some of the “healthy” foods into the 20 percent category (like animal protein, grains, and dairy), Dr. Weiner says. This is because certain foods can be part of a healthy diet for many people, but others may feel better (or have more weight loss success) when those foods are considered an “indulgence.” That said, it’s always best to talk with your doctor or a nutritionist before trying a new diet.

Foods To Eat On The 80/20 Diet

Suggested foods for the 80 percent:

• Whole or plant-based foods (fruits and veggies)
• Lean protein (chicken, fish, tofu, turkey, and tempeh)
• Seafood rich in omega-3s (salmon, herring, and trout)
• Whole grains (oatmeal, quinoa, barley, and wild rice)
• Low-fat dairy (plain Greek yogurt and cottage cheese)
• Monounsaturated fats (Nuts, seeds, and olive oil)

Foods that typically make up the 20 percent:

• Foods high in saturated fat (fried chicken, cheese, and bacon)
• Processed foods (ice cream, pizza, and breakfast cereal)
• White sugar and refined carbs (bagels, pastries, and pasta)
• Alcohol and sugary beverages

Benefits Of The 80/20 Rule

One of the biggest advantages of the 80/20 diet is that it doesn’t require calorie counting. You may prefer to track calories to make sure you’re nailing the 80/20 ratio, but it’s not an essential part of the diet. “80/20 doesn't require you to limit the total amount of food you eat, so you can eat whenever you get hungry and not feel like you're starving yourself,” says Dr. Weiner. The ability to recognize your hunger cues is one of the secrets to long-term compliance with an eating plan, he adds.

It’s far less restrictive than other elimination-based diet plans since it focuses on moderation instead. Plus, the 80/20 diet can promote long-term, sustainable lifestyle changes, says Amy Elizabeth Rothberg, MD, director of the weight management clinic at Michigan Medicine. “It could be ideal for people who are so busy with work, community, kids, and activities that they don’t have time for a more aggressive strategy, [but who still want to move toward] a more wholesome, balanced diet.”

Downsides Of The 80/20 Rule

Since the diet is mostly self-directed and can be subjective, some experts say it can be tough to know if you’re actually achieving an 80/20 balance. “A disadvantage of any moderation-based approach is we tend to overestimate our healthy decisions and underestimate the unhealthy ones,” says Dr. Weiner. “Without a detailed tracking system, what you consider as an 80/20 diet may actually be a 60/40 one.”

Labeling foods as “good” or “bad” can also be harmful for anyone with a history of disordered eating or a sensitivity to the pressures of diet culture. Foods are not inherently “good” or “bad”—instead, the 80/20 diet is about finding a sustainable eating plan (think: veggies, fruits, lean protein, and complex carbs) that provides your body with fuel and nutrients that help you feel good.

How To Follow The 80/20 Rule

Before trying 80/20, it may be helpful to use a food journal and take stock of the types of foods you're consuming. If weight loss is your goal and calorie counting doesn’t bother you, it may also help to do a bit of math to see exactly how much you're eating, says Dr. Rothberg.

“Take stock of your daily and weekly intake by logging calories for a couple of days—both during the typical work or school week and also on the weekend,” she says. This includes your consumption of alcohol and high-calorie foods. This can give you a “baseline” of how much you consume regularly and help you identify if you eat more or less on some days compared to others, Dr. Rothberg says.

From there, you can decide how to frame your 80/20 percentage split. You can either calculate how many specific calories make up 80 percent of your daily or weekly intake or count how many meals and snacks comprise 80 percent of what you eat in total. Then, everything else you eat can fall into the remaining 20 percent.

It doesn’t matter whether you apply the 80/20 rule to each day (like eating three healthy meals and one treat) or to a seven-day week (like eating healthy for five days and then relaxing your diet restrictions for two), Dr. Rothberg says, sometimes known as the "weekend diet." That said, here are two broad ways to apply 80/20 to your life:

How To Eat 80/20 On A Daily Basis

Fill the majority of your meals and snacks with healthy, nutrient-dense foods from the compliant list above. Then, your 20 percent “indulgence” can involve a bag of chips in the afternoon, a glass of wine (or weight loss-friendly co*cktail) with dinner, or a few squares of dark chocolate for dessert.

How To Eat 80/20 On A Weekly Basis

Stick to your healthy food and/or calorie goals for five days in a row (for example, on weekdays). You don’t have to be overly strict—that might leave you tempted to swing too far the other way when the weekend arrives—but try to make healthy choices as close to 100 percent of the time as possible from Monday through Friday. When the weekend comes, you can relax your calorie goals. But remember, even on the “indulgence” days, you still want to have mostly well-balanced meals—especially if weight loss is your long-term objective.