Evaluating Meal Replacement Shakes: Pros and Cons Based on Expert Opinion

Skipping lunch today? How about a shake instead?

Meal replacement shakes are becoming more enticing, especially as so many people seek quick, convenient ways to manage their busy schedules without compromising on nutrition.

While these drinks promise balance and ease, should you actually replace your meals with them?

What are meal replacement shakes?

A few years ago, meal replacement shakes were a novelty that was used in very specific circumstances, such as by those recovering from illnesses or extremely busy people. Nowadays, meal replacement shakes are popping up in local grocery stores, with more people opting to have a specialized shake instead of a whole-food meal.

In essence, meal replacement shakes contain all the macro and micro nutrients needed to support overall health. They are not just the whey protein powders so commonly found in gym-goers' pantries. These shakes provide not only protein but also carbohydrates, fats, vitamins, minerals, and even fiber. In other words, a good meal replacement shake should cover nutritional needs, not just increase protein intake.

Keep in mind that products marketed as ‘meal replacements’ can vary significantly, with differing amounts and types of fats, carbohydrates, protein, fiber, and micronutrients. Some of them also contain added sugars. Read the label to ensure that it suits your dietary needs.

Reasons why people choose meal replacement shakes

Why skip lunch, you might ask? Well, meal replacement shakes are used for a variety of reasons.

To save time

For those who do not have the time to prepare a full meal, meal replacement shakes can be a great way to have a nutritious meal. Bodybuilders, for example, sometimes rely on meal replacements because they usually follow a very strict eating regimen that requires them to consume a lot of calories throughout the day, sometimes having up to six meals per day.

To support their fitness goals

Some people choose meal replacement shakes as a way to support weight loss or muscle gain. Meal replacements offer better meal control, as each shake provides a set number of calories and nutrients, making it easier to track intake and avoid overeating.

Keep in mind that protein shakes, often used for muscle gain support, are not considered to be meal replacements as they do not contain all the nutrients needed for one’s health.

To support special dietary needs

Meal replacement shakes can be useful for people who have difficulty eating solid food, have reduced appetite, or need consistent nutrition due to illness or recovery.

Sometimes, meal replacement shakes can be helpful for people who have avoidant/restrictive food intake disorder and have issues eating a varied diet.

Meal replacement shakes for weight loss

A big chunk of meal replacement shakes on the market are promoted for weight loss, but are they really effective?

As explained by Helen Tieu, Registered Dietitian (RD), meal replacement shakes offer convenience and make portion control easier due to the predictable calories in each shake. When incorporated into a diet that also includes whole foods, they may help support weight loss goals. That said, whole foods remain the gold standard for long-term health.

“Many clients have tried diets that rely on meal replacement shakes and report short-term, often rapid weight loss. However, they frequently regain weight once they stop, because a shakes diet alone doesn't teach sustainable nutrition habits,” highlights Tieu.

Other drawbacks to consider

Meal replacement shakes may not keep you as full as solid meals, which can lead to hunger and overeating later in the day.

They also lack the variety of textures and flavors that whole foods provide. Relying too heavily on shakes can make it difficult to develop sustainable eating patterns, and some people find themselves bored with the taste after frequent use.

Some people might also have side effects such as bloating, gas, or diarrhea, especially if the product contains high levels of fiber additives or sweeteners.

Beyond nutrition, there’s also a social element. As pointed out by Tieu, her clients often say they miss the experience of sharing a meal with others, which plays an important role in long-term habits.

Choosing a meal replacement shake

Read the label to make sure that your chosen replacement shake:

• Contains protein. Aim for at least 20 grams of protein per shake.
• Contains fiber. A meal replacement shake should contain at least 5 grams of fiber.
• Is low in sugar. Some products contain relatively high levels of added sugar. Depending on your goals, it should ideally be less than 5 grams per portion. Be sure to check the label for extra sweeteners to see if you can tolerate them.

Bottom line

Let me tell you, I’ve actually tried meal replacement shakes in the past. Why? I don’t like to cook. Simply enough, I don’t care much about food — at least not enough to actually spend time in the kitchen.

And honestly? I am not a big fan. I might think I don’t care about food much, but perhaps I do (to some extent). While the shakes I tried actually did keep me full, they also got really boring soon. And I don’t even crave variety that much.

At the end of the day, convenience is not enough, and nothing beats having real meals with your family, friends, and loved ones.