Do you often question your protein intake? This is a question that Debbie Fetter, a nutrition associate professor at UC Davis, frequently poses to her students. In her large lecture hall of over 500 people, nearly every student raises their hand in response.
Protein is clearly a major concern for many consumers. A 2024 survey of 3,000 Americans indicates that a lot of people are actively seeking to increase their protein consumption. Research also reveals that foods marketed as “high in protein” tend to attract more interest from shoppers.
As people become more conscious of what they eat, they’re also starting to think about the quality of their protein sources.
“It’s important for individuals to diversify their protein sources,” says Andrea Glenn, an assistant professor of nutrition at NYU. She further explains how to meet personal dietary needs while ensuring nutritional adequacy for health.
What is protein and why does it matter?
Protein is crucial for tissue building and repair, as well as the production of enzymes, hormones, and immune system antibodies. It consists of amino acids, with our bodies using 20 different amino acids—11 can be synthesized by our bodies, while the other nine must come from our diets.
New U.S. dietary guidelines recommend that adults consume between 1.2 to 1.6 grams of protein for every kilogram of body weight daily. This is an increase from the previous guideline of 0.8 grams, although some experts feel that this revision may be unnecessary or could result in diets that lack balance.
Fetter notes that simply consuming more protein doesn’t necessarily lead to increased muscle or lean body mass.
A shortage of protein can lead to issues like muscle loss and poor metabolism, while excessive intake may put strain on the kidneys, according to Nicole Stob, an assistant teaching professor in integrative physiology at the University of Colorado, Boulder.
Why consider your protein sources carefully?
“Every protein has its own role,” Fetter states. The best type varies from person to person based on individual dietary needs and preferences.
A primary point for diversifying protein intake is nutritional variety. “While protein is vital, it’s not the only factor influencing health,” Glenn explains.
Different protein sources also offer unique nutrients such as fiber, vitamins, and minerals. She emphasizes the benefits of obtaining protein from whole foods rather than highly processed options.
There’s also an environmental angle. Plant-based proteins generally have a smaller carbon footprint than animal proteins, especially red meats. A 2024 study indicated that reducing red meat consumption from four to two times a week could positively impact both your carbon footprint and longevity.
Beef
Protein content: The protein content in various beef cuts can differ. For example, 3 ounces of ground beef packs approximately 22.2 grams of protein, versus about 28.6 grams in the same amount of beef shank cross-cuts.
Other nutritional advantages: Beef is a complete protein source, which means it contains all the essential amino acids that our bodies can’t produce. A moderate intake of lean beef, as part of a balanced diet, is suggested not to elevate heart disease risks, while still providing beneficial nutrients such as omega-3 fatty acids, vitamin B12, niacin, zinc, and iron.
Cons: However, beef can also be high in cholesterol and saturated fats. Medical sources suggest that while there aren’t strict guidelines on red meat consumption levels, smaller portions are advisable. Opt for cuts labeled as “lean” or “extra lean” to help manage fat and cholesterol intake.
Pork
Protein content: On average, an ounce of pork holds around 7 grams of protein, but this can vary with preparation methods. For example, 100 grams of ham offers roughly 19 grams while pork chops deliver about 26.6 grams.
Other benefits: Fresh pork is often categorized as a high-quality, budget-friendly protein, rich in B vitamins and minerals like zinc and iron. Some studies suggest that consuming lean pork post-exercise may aid muscle recovery.
Cons: Processed pork products, such as bacon and ham, have been linked to increased health risks, including heart disease and certain cancers, prompting concern from health organizations.
Chicken
Protein content: Cooked chicken typically contains around 23 to 31 grams of protein per 100 grams, comparable to that of other meats.
Other nutritional benefits: Lean chicken is noted for providing essential nutrients like potassium, iron, and B vitamins, making it a healthy option.
Cons: Preparation methods can impact chicken’s nutritional profile. While unprocessed chicken is healthy, processed varieties may have high sodium levels.
Fish
Protein content: Generally, fish contains about 7 grams of protein per ounce. Specific types can vary significantly; for instance, a raw tilapia fillet is around 23.3 grams of protein, whereas cod has about 17.7 grams.
Other nutritional advantages: Fish provides valuable nutrients like omega-3 fatty acids, and vitamin D, and is known for having lower saturated fat compared to other meats. Experts recommend consuming two to three servings weekly.
Cons: While fish is a dependable source of protein, it can be pricier compared to alternatives like canned fish.
Eggs
Protein content: One large egg has about 6.2 grams of protein, regardless of whether it’s cooked.
Other benefits: Eggs are nutrient-rich, supplying protein, fat, and several B vitamins. They are considered low-calorie, low-cholesterol options.
Cons: However, egg yolks can contain significant cholesterol, leading some experts to recommend eating them in moderation, though recent research suggests their impact on heart disease risk may not be as severe as once thought.
Beans
Protein content: Beans, such as kidney beans, provide around 8 grams of protein per half-cup serving, though they are considered incomplete proteins.
Other advantages: High in fiber and nutrients, beans can promote heart health. While they may have slightly lower protein content compared to meat, they make up for it by offering fiber that many diets lack.
Cons: For those unaccustomed to high-fiber foods, beans can lead to digestive discomfort; gradual introduction is key.
Lentils
Protein content: Half a cup of lentils contains about 9 grams of protein.
Other benefits: Lentils are rich in minerals and fiber and may help reduce blood pressure. They also support weight management.
Cons: Similar to beans, consuming lentils may cause gas or bloating for some individuals who aren’t used to high-fiber foods.
Tofu
Protein content: Tofu’s protein content varies, but generally, a half-cup of firm tofu offers around 21.8 grams of protein. It’s classified as a complete protein.
Other benefits: Tofu is also rich in fiber, magnesium, and other nutrients. Its isoflavones may contribute to heart health and lower risks of certain diseases.
Cons: Tofu contains soy, which may not be suitable for those with soy allergies.
Protein Powders
Protein content: Protein powders can range in protein content, with servings typically containing 20-25 grams. However, there’s no strict regulation, so quality can vary.
Other nutritional benefits: Some protein powders contain added vitamins and minerals, although the accuracy of their content may not always match the label claims.
Cons: Extra protein doesn’t always result in more muscle and can introduce excess calories. Many powders may also contain added sugars, which should be avoided.
