Protein shakes have become increasingly popular as a convenient way to supplement diets, particularly for those looking to manage their weight, build muscle, or simply increase their protein intake. Consuming more protein can help you feel full longer, build lean muscle, and support your metabolism. But what happens when you incorporate protein shakes into your diet every day for a month? This article explores the potential results, benefits, and important considerations of embarking on a 1-month protein shake diet.
Why Protein Matters for Weight Loss and Overall Health
Protein is a vital nutrient that plays a significant role in various bodily functions. Getting enough protein may support a healthy metabolism and reduce your appetite. It may also help you lose body fat without losing muscle. It's not just for bodybuilders; adequate protein intake is essential for everyone. Protein has been shown to help decrease hunger and appetite.
The Science Behind Protein and Satiety
One key reason is that protein generally helps you feel full for longer. This is partly due to the release of fullness hormones GLP-1 and PYY. Studies also show that higher protein intake may result in less hunger throughout the day.
In one small 2015 study, a high protein breakfast helped older women consume up to 135 fewer calories later in the day, compared with a low protein breakfast or skipping breakfast. One 2016 meta-analysis of five studies also connected high protein intake and increased fullness. However, review authors caution that factors like body weight, eating behavior, and other health issues all play a role in the sensations of fullness.
Furthermore, another review published in 2020 reports that ingesting more than 35 grams (g) of protein at once appears most effective for effects like less hunger, a reduced desire to eat, and greater feelings of fullness. Only a few studies have looked at protein shakes and appetite specifically. One 2019 study with nine young women with obesity found that a whey protein drink actively reduced appetite.
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In a 2021 study, participants given a high protein shake before their workout reported feeling less hungry after exercising than when given a lower protein shake with an equal number of calories. Thus, while results are promising, numerous factors may affect the influence of protein shakes on appetite and hunger.
Protein's Role in Muscle Building and Metabolism
A high protein diet, especially when combined with strength training, can help build muscle. Because muscle aids metabolism and energy production, building muscle is a great way to keep your metabolism healthy.
This is especially true if you follow a calorie-restricted diet to lose weight. That’s because extreme calorie restriction may result in muscle loss and fat loss. This loss of lean muscle may slow your metabolism, making it easier to regain weight once you stop the restrictive diet.
Conversely, eating sufficient amounts of protein, combined with strength training, may help prevent this muscle loss and resulting metabolic slowdown.
A 13-week study in older adults with obesity found that those who consumed an extra 20 g of protein weekly (in the form of a shake) gained 2.8 pounds (lb), or 1.3 kilograms (kg), more muscle mass than those who ate less protein. Plus, in a 6-week study, participants followed either a low or high protein diet, which included shakes. Each diet was calorie-restricted. Notably, participants following the higher protein plan gained 2.4 lb (1.1 kg) more muscle and lost 2.9 lb (1.3 kg) more fat.
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Your body also uses more energy to digest protein than it does fat or carbs, which means your body burns more calories in the process. This effect, called the thermic effect of protein, may provide a slight metabolism boost.
Protein for Weight Loss and Maintenance
Although few studies use protein shakes specifically, researchers generally agree that high protein diets are an effective way to lose weight and body fat. A 14-week study gave women with overweight or obesity a resistance exercise program alongside a high carb or high protein, calorie-restricted diet. Those in the high protein group lost 1.7 times more body fat than those in the high carb group.
In a 12-week study, women with a moderate weight but high body fat percentage followed either a high or standard protein diet. Those on the high protein diet lost an additional 3 lb (1.4 kg) of body fat and around 1 inch (2.2 centimeters) in waist circumference. The participants in the high protein group also retained significantly more muscle mass than those on the standard protein diet.
A 2020 review further suggests you can minimize weight regain by following a high protein diet in the first 3-12 months after losing weight. However, long-term studies must confirm whether this effect lasts beyond the first year. Still, a small 2017 study found that when participants with excess weight drank low sugar protein shakes as part of a diet program, their weight loss improved.
Because so many lifestyle and ingredient variables are involved in weight loss studies, it’s hard to draw a direct connection between protein shakes and weight loss. Protein’s effect on metabolism, appetite, and muscle mass may also help prevent regaining weight once you’ve lost it. This effect should apply whether you get protein from shakes or whole foods.
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One 2015 review suggests that higher protein intakes of 25-30 g per meal improve both weight loss and weight management. However, researchers caution that full adherence to a high protein diet, plus other lifestyle factors, is usually necessary. Similarly, studies suggest that high protein diets result in less short-term weight regain after you lose significant amounts of weight. All the same, more studies are needed.
Diving into a 1-Month Protein Shake Diet
A 1-month protein shake diet typically involves replacing one or more meals with protein shakes while maintaining a balanced intake of nutrients from other food sources. Protein shakes are made by mixing protein powder with water or another liquid, plus optional other ingredients. Although most people don’t need protein shakes to meet daily protein requirements, protein shakes can be convenient if you have limited access to high protein foods or experience trouble meeting your needs through food alone. You can buy protein powder and mix it yourself or purchase premade liquid shakes.
Choosing the Right Protein Powder
Different types of protein powders contain different nutrients. When selecting a protein powder, it's essential to consider the various options available and their unique characteristics. Here's a breakdown of common types:
- Whey protein: quickly absorbed, dairy-based, and contains all nine essential amino acids
- Casein protein: slowly absorbed, dairy-based, and provides all essential amino acids
- Soy protein: plant-based and offers all essential amino acids, plus soy isoflavones that may provide some health benefits
- Hemp protein: plant-based, contains all essential amino acids, rich in omega-3 and omega-6 fatty acids, and has a high arginine content
- Rice protein: plant-based but lower in the essential amino acid lysine
- Pea protein: plant-based and less allergenic alternative to soy and whey protein, but lower in the essential amino acids cysteine and methionine
Certain protein powders and drinks contain a mix of protein types. For example, many plant-based brands combine types to diversify the amino acid profile. Some dairy-based protein powders combine whey and casein to provide immediate and longer lasting effects on muscle synthesis.
Which type of protein is best for protein shakes?
Different types of protein may affect your body in distinct ways. For instance, whey is typically absorbed more quickly than casein. This makes it optimal for promoting muscle protein synthesis after exercise. It may also help you feel less hungry in the short term. While some small studies have shown whey protein to be more effective for weight loss than soy and other plant-based proteins, others show no real difference. As such, individual lifestyle factors may be more important than the type of protein regarding weight loss or other desired outcomes.
One key factor to consider is the quality of protein you purchase. Whey, casein, and soy are considered complete proteins. This means they contain sufficient amounts of all the essential amino acids your body needs. All the same, these three may induce an allergic reaction in some people. Rice and pea protein are often considered less allergenic. However, rice protein is low in the essential amino acid lysine. Pea protein is low in the essential amino acids cysteine and methionine. Hemp protein is also considered less allergenic. Furthermore, it contains sufficient levels of all essential amino acids. As such, it can be considered a complete source of protein.
As long as you regularly consume a variety of protein sources, opting for incomplete proteins in your protein shake is unlikely to be a problem. That said, it’s always best to talk with a doctor or registered dietitian before adding new supplements to your diet.
Enhancing Protein Shakes with Whole Foods
Protein powders aren’t the only way to add additional protein to your shakes. Here are a few whole foods you can use in place of protein powder:
- Greek or plant-based yogurt: Greek yogurt is naturally rich in protein, as are plant-based alternatives made from soy. Each provides around 6-10 g of complete protein per 3.5 ounces (oz), or 100 g.
- Nuts and seeds: Most nuts and seeds pack around 5-7 g of protein per 1 oz (28 g). Combine with soy or hemp milk for a complete source of plant-based protein.
- Spirulina: This blue-green algae offers around 8 g of complete protein per 2 tablespoons (14 g). This serving also covers 95% of the Daily Value (DV) for copper and 22% of the DV for iron.
- Tofu: This popular soy food contains around 5-13 g of complete protein per 3.5 oz (100 g), depending on the variety. It has a naturally mild flavor, so you can blend it with frozen fruit and liquid to yield a protein-rich shake.
- Puffed quinoa: This pseudocereal provides around 10 g of complete protein per 2.5 oz (70 g). Expect it to thicken and add a slightly nutty flavor to your shake.
- Oats: This grain offers around 5 g of protein per 1.5 oz (40 g). Combine with cow’s milk or hemp milk to get a complete source of protein.
These protein-rich ingredients are an easy addition to homemade shakes. Simply combine them with your choice of dairy or plant-based milk, fruit, and leafy greens for a nutrient-rich, whole-food alternative to protein powder-based shakes.
Potential Benefits of a 1-Month Protein Shake Diet
Embarking on a protein shake diet for a month may yield several positive outcomes, depending on individual factors and adherence to a balanced dietary approach.
Weight Loss and Management
For individuals like Monica Michaels, who experienced a weight loss plateau, incorporating protein shakes can "shock your body into losing weight again," especially for those over 50. As Harvard-trained nutrition expert Ian K. Smith, MD, explains, a sudden switch from solid to liquid food startles your system. “When your body can’t predict what’s coming, it is less efficient,” explains Harvard-trained nutrition expert Ian K. Smith, MD. That means your body becomes less effective at fueling itself, and as a result, you start burning more calories. In fact, as your system flounders, “it stimulates maximum fat burning.” Even a ‘menopause metabolism’ soars - and plateaus are busted! What’s more, easy-to-digest shakes help older folks absorb more amino acids from protein, causing fat burn in aging muscles to double, per a University of Arkansas study.
- Increased Satiety: Protein shakes can help you feel fuller for longer, reducing overall calorie intake.
- Metabolism Boost: The thermic effect of protein can provide a slight increase in metabolism.
- Muscle Preservation: Combining protein shakes with strength training can help prevent muscle loss during calorie restriction.
Increased Energy and Reduced Cravings
Jamie Lee McIntyre, a Registered Dietitian-Nutritionist, highlights the benefits of protein shakes for stabilizing blood sugar levels. Including more protein can help stabilize blood sugar levels, which may translate to steadier energy and better focus for many people, according to Blatner. Then there’s what she calls the fullness factor-protein’s impact on satiety. energy crashes, sugar cravings, and late-night snacking,” Blatner says.
Maria Serra, who experimented with high-protein breakfasts for 30 days, noted significant improvements in alertness and energy levels. The midday slump used to be so real for me. However, after a chocolate peanut butter power shake or an open-face frittata sandwich, I felt satiated well through the mid-afternoon and was no longer yawning after lunch. Considering this was the only lifestyle habit I had changed recently, I chalked it up to my newfound protein goals, as protein helps prevent blood sugar spikes and crashes that lead to a snoozy afternoon.
- Stable Energy Levels: Protein helps prevent sharp rises and dips in blood sugar, promoting consistent energy throughout the day.
- Reduced Cravings: Protein can help satisfy sweet cravings and reduce the urge to snack on unhealthy foods.
Improved Workout Performance
Maria Serra also experienced improved workout performance during her 30-day high-protein breakfast challenge. I am obsessed with going to cycling classes. In the early fall, I found myself struggling to stay on beat during 45-minute rides at my local studio. But about 10 days into my high-protein breakfast experience, I found myself keeping up with the instructor, and even going above and beyond in class, adding resistance and hitting the beat of the music with more ease than before.
- Enhanced Muscle Recovery: Protein supports muscle repair and maintenance after exercise.
- Increased Strength: Adequate protein intake can contribute to improved strength and endurance during workouts.
Important Considerations and Potential Drawbacks
While a 1-month protein shake diet can offer numerous benefits, it's crucial to be aware of potential drawbacks and considerations.
Supplement Quality and Safety
The Food and Drug Administration (FDA) doesn’t typically review supplements for safety and effectiveness before they hit the shelves. Thus, it’s important to research the ingredients in your protein powder and the brand’s trustworthiness. When possible, choose a protein that has undergone third-party testing. Additionally, suggestions for serving sizes also vary by brand. Make sure to check nutrient labels to be sure you’re getting the amount of protein you desire.
Potential Side Effects
If you’re lactose intolerant, drinking protein shakes made with whey or casein may cause side effects, such as:bloatingcrampsgasdiarrheaYou can avoid these symptoms by switching to protein powders not derived from dairy, such as those made with protein from:eggspeassoyhemp
While most research suggests high protein diets are safe, people with underlying kidney issues may need to avoid them. If you have kidney complications, talk with your doctor before increasing your protein intake. Most adults can easily get enough protein through food sources without drinking protein shakes. That said, protein shakes can be a delicious way to add extra protein to your diet.
Taste and Variety
Jamie Lee McIntyre noted that the aftertaste in some protein powders can be unappetizing. In some products, the notes of fake vanilla and sugar substitutes were less than appetizing. The first shake I mixed up with the Muscle Milk powder was difficult to finish. To make the next one more palatable, I used less powder than recommended and added a heaping spoonful of peanut butter to mask the taste.
- Choose High-Quality Powders: Opt for protein powders with minimal artificial sweeteners and additives.
- Experiment with Flavors and Add-Ins: Vary the ingredients in your shakes to prevent boredom and ensure a balanced nutrient intake.
Practical Tips for a Successful 1-Month Protein Shake Diet
To maximize the benefits and minimize the drawbacks of a 1-month protein shake diet, consider these practical tips:
Calculate Your Protein Needs
Maria Serra used the Women's Health High-Protein Meal Prep Manual to calculate her protein needs based on her weight. I was around 158 pounds when I started my experiment, so I used the tip within the manual from Jarosh and calculated that I needed about 86-87 grams of protein daily to start. I set a gentle goal for myself to aim for roughly 20 to 28 grams at breakfast. Since the breakfast recipes generally packed between 20 and 28 grams, I really didn't have to do any thinking about the protein number and knew I was getting what I needed in a serving.
- Consult a Professional: Work with a registered dietitian or nutritionist to determine your individual protein requirements.
- Distribute Protein Evenly: Aim to consume protein at each meal to optimize satiety and muscle protein synthesis.
Plan Your Meals and Snacks
Meal replacement shakes might be your favorite diet ever. However, it's important to plan your meals and snacks to ensure you're meeting your nutritional needs.
- Focus on Whole Foods: Prioritize whole, unprocessed foods for the majority of your meals.
- Incorporate Fruits and Vegetables: Add fruits and vegetables to your shakes and meals to boost fiber, vitamins, and minerals.
Listen to Your Body
Full transparency: The first few days of higher protein counts made my stomach feel bloated and uncomfortable-which is a normal side effect of upping your protein intake suddenly for some people. I found relief within a few days, but making sure I ate fiber-packed lunches (think: grain bowls, roasted vegetables) to keep things moving and drinking plenty of water all day long helped my digestive system hit its stride and adjust to the new boost.
- Stay Hydrated: Drink plenty of water throughout the day to support digestion and overall health.
- Monitor Your Progress: Track your weight, energy levels, and overall well-being to assess the effectiveness of the diet.