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Does Whey Have Casein? | Ask The Fitness Nerd

Does Whey Protein Also Contain Casein? We Sort Out The Milk Protein Mystery Once and For All.

Dear Fitness Nerd,

I’m a little confused about whey and casein protein. Does whey also contain casein? And vice versa?  All I know is that both whey and casein are in milk.  Can you help me sort this out? — Janine (Dunwoody, GA)

You’re right that both whey and casein are proteins in milk.

But the important thing to grasp is that they are two totally different kinds of protein.

So in their purest form – isolated from the milk itself (for example in protein powder supplements) — whey typically doesn’t contain meaningful amounts of casein. Same goes for casein in regards to whey content.

Understanding Milk Proteins: Whey vs. Casein

The easist way to think about this is in the context of milk.

Milk contains about 80 percent casein protein, and 20 percent whey. Under normal conditions, you would never be able to differentiate between the whey and casein in milk visually. It just looks … well … liquid and “milky.”

However, when you add an acid or enzyme like rennet (which is used in cheese production), the milk will curdle. This literally separates the whey from the casein proteins.

The result is that the whey — which is a semi-clear liquid — will rise to the top, while the casein (which is heavier and coagulates in the presence of an acid or enzyme) will usually sink to the bottom.

In cheesemaking, the whey is siphoned off from the casein, and the solids are then drained through a cheese cloth, further extracting any residual whey or water and leaving the firm casein solids, which are then shaped into blocks of cheese (there are more steps, but I won’t get into them here.) 

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Definition of Casein | Fitness, Health & Exercise Glossary

What is Casein? Learn the Definition of Casein Protein, Its Characteristics and Uses.

Definition of Casein

Casein (also known as “casein protein”) is a phosphoprotein found in cows milk and cheese. Casein is one of two primary proteins in dairy, the other being whey. Casein protein comprises approximately 80% of the protein in dairy and is the main protein in cheeses.

Casein coagulates in the presence of certain proteases, such as rennet and acids. In cheese making, protease enzymes in the form of rennet are added to milk, causing the casein proteins to separate from the liquid whey. The casein is then processed into cheeses.

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What’s The Highest Protein Content Food? | Ask The Fitness Nerd

Which Food Has The Highest Protein Content? We Dig Into The Numbers and Settle a Bet. Sort Of …

Dear Fitness Nerd,

Can you tell me what is the highest protein content food? My buddy and I have a bet going on this one. He says eggs and I say whey protein isolate has the highest protein. Who’s right? I have $25 bucks riding on this. Thanks. — Josh (Dayton, OH) 

Josh, let me take a shot at this.

Unfortunately, this could actually come to a draw, because you both are kind of right but also both wrong. If I sound like a Zen Buddhist monk, my apologies. This will make more sense in a minute. The good news is by the time your done, you will have a pretty good understanding of how to accurately compare protein content in foods.

How To Determine Protein Content In Food

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Taking Protein Before Bed? When & What Kind of Protein? | Ask The Fitness Nerd

When is the best time to take protein before bed? And what kind of protein should you take before you sleep?

Dear Fitness Nerd,

How soon before bed should I drink protein? Right before, or a specific number of minutes before before I actually go to sleep? Thanks! — Bob

The issue here is less about the timing of when to take protein before bed, as it is what kind of protein to take before you go to sleep.

You should try to consume your last serving of protein as close to your bedtime as is comfortable for you. Whether that’s a protein shake before bed, or a whole food souce of protein before sleep is up to you.

Some people experience no problems eating and then immediately going to sleep, while other people find sleeping on a “full stomach” uncomfortable. If you find that taking a protein-heavy snack right before bed interferes with falling asleep, then give yourself at least 30-40 minutes between the snack and bedtime.

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Does Whey Protein Help With Weight Loss? | Ask The Fitness Nerd

Is the whey protein-weight loss connection fact or fiction? Find out from the Fitness Nerd if using whey protein for weight loss is “yeah” or “nay. “

Dear Fitness Nerd,

I have a question for you around whey protein and weight loss.

I would consider myself to be pretty fit. I lift weights, run and do Body Pump and am pretty lean already, although I don’t know my exact body fat right now.  I’d really like to make this the year that I get flat abs, but I still have some belly fat I’d like to make go away. Nothing major, just a little “pooch” and a smidge more side and back fat than I want …. we’re not talking a muffin top or anything like that though.

My girlfriend suggested that I try drinking more whey protein to lose weight. Her boyfriend is in really good shape and drinks a ton of protein shakes and she seems to believe that’s why he is so lean. She’s in great shape herself and uses a lot of whey protein, so I’m inclined to believe her.

What are your thoughts here?  I really just want to lose those last couple of lbs of belly fat. I’m fairly tall and already pretty toned, it’s just my damn belly that I want to tighten up. Can whey protein help with this?

By the way, I already drink whey protein powder once a day in soy milk, usually in the morning and sometimes after I work out.  Thanks for your time. Alicia (Long Island, NY)

Alicia, this question pops up a lot on discussion boards and in places like Yahoo Answers and Yedda.  So you’re not the only one who is trying to figure out if there is really a connection between whey protein and weight loss.  I probably see a variation on your question at least 2-3 times a week.

There are definitely a lot of “opinions” floating around out there around whey protein for weight loss. There’s some truth to them, but they are also tied up in a lot of myths, as well. So the trick is to understand exactly what whey protein is (and isn’t) so you can come to your own conclusions based on the facts.

What Is Whey Protein?

Whey is just a form of protein that is naturally-present in diary products like skim milk, cottage cheese, yogurt, etc. If you drink a glass of milk, you are already consuming some whey proteins. The whey protein that you are talking about is in a powdered form. Basically, the manufacturer takes liquid whey and “dries it”, making whey protein powder – a form of whey that is portable and easy to reconstitute.

So What Does Whey Protein Do For A Person?

The main benefit to whey protein is that it is easily and quickly digested by the body.

The body is also able to quickly utilize most of the amino acids in whey protein to help with tissue repair and recovery after exercise.  The protein in whey has a high biological value (BV), meaning it’s easily absorbed by the body. Unlike other proteins, like casein (another form of protein in milk), the speed at which whey protein is digested makes it an ideal source of protein immediately following workouts when your body needs amino acids quickly to aid with recovery.

Whey protein, especially whey protein isolate (an even more concentrated form of whey protein vs. whey protein concentrate), is also very low in fat and carbohydrates. This is because the refinement process used to create whey protein powder removes nearly all of the fat and sugars in the liquid, leaving a final product that is almost 100% protein by volume.  So this makes whey protein popular among dieters and people who are trying to limit carbohydrates or fat in their diet.

Whey protein has other properties that may have health benefits, including the presence of certain biologically active compounds that may improve immunity and even stave off muscle wasting. However, the main reason people consume whey protein is to encourage lean muscle growth and sometimes as a meal replacement.

Using Whey Protein For Weight Loss

Okay, now that you know what whey protein is, let’s tackle your question about whey protein and weight loss.

First, it’s important to understand that there is nothing particularly magical about whey protein that will directly cause you to melt off that last pound or two of belly fat and get abs like Jessica Biel. Whey protein is not an anabolic steroid — it’s a food.

In fact, the goal of drinking whey protein is usually to add weight (in the form of additional muscle), not to lose it. 

That said, because your real goal here isn’t to lose scale weight, but to lose body fat and change your body fat percentage to favor lean tissue, including some additional whey protein in your diet could help you become leaner overall … and yes, that would probably include losing some belly fat.

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What’s The Best Time to Drink Protein Shakes? Ask The Fitness Nerd

When should you drink a protein shake? Today we tackle the question of what’s the best time to reach for that protein shake.

Dear Fitness Nerd:

I’ve read a lot about the benefits of protein shakes, especially when it comes to building muscle and becoming leaner. But I’ve seen conflicting advice on when the best time is to drink protein shakes, and how often I should be consuming them. Some people say right before you workout, others say immediately following your workout, and some people seem to drink them 3-4 times a day or more. I’m confused. Can you help clear this up? Thanks. Sarah M. (Albany, NY)

Sarah,

This is a great question.  

The first thing to realize is that protein shakes are intended to be supplemental to your regular whole meals — not replacements for whole meals. So if you view it that way, you should typically be consuming no more than 2-3 shakes a day on your workout days, and 1-2 (if any) protein shakes on your non-workout days.

In general, the two most critical times for drinking a protein shake are:

1. First thing in the morning
2. Immediately following your resistance or weight training workout.

Why first thing in the morning?

Well, when you wake up, you have essentially been in a fasted state for the past seven to eight hours. That means you’ve had no protein during this time and you are at risk for becoming catabolic (meaning you’ll start to break down muscle for fuel.) By drinking a protein shake with some simple carbs (like orange juice or a banana blended in) as soon as you wake up, you can stop this muscle breakdown dead in its tracks and put yourself back in “positive nitrogen balance” — a fancy term that simply means you have more protein available for your body than what it is using for fuel or excreting.

The second key window of opportunity for drinking a protein shake is immediately following your resistance or weight training workout.

During this 30-60 minute post-workout window, your muscles are like sponges and take up nutrients — including protein — very quickly as part of the repair and recovery process. Your body also utilizes carbohydrates more efficiently during this period, due to increased insulin sensitivity, so drinking your protein shake with some simple carbs can help the body more efficient absorb amino acids and utilize them for ongoing tissue repair and growth.

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