by Mary Perry

Zone Living: All You Need to Know About ProteinProtein is no longer the nutrient geared solely for body builders and gym buffs. While it plays a role in building and preserving muscle mass, its benefits are more vast, ranging from weight loss and maintenance, to improved mood.

It’s quite common to see commercials touting products and how many grams of protein they contain. While it’s important to have some at every meal and snack to help control blood sugar levels and to keep you full, you don’t want to overdo it on this nutrient either. So what is the right amount to consume?

Plus, not all proteins are created equal, so which proteins are right for you? Here is the lowdown on what you need to know the next time you’re shopping for your protein fix.

What Is Protein, and What Does It Do for My Body?

Protein is an integral component in each and every cell in our body.  It’s used to make enzymes, hormones and neurotransmitters, and is found in our muscles, bone, skin and hair.

The building blocks that make up protein are called amino acids. Think of amino acids like beads on a chain. Each bead represents an amino acid and when the chain is complete, the end product is considered the protein. There are 20 amino acids in all:

  • Non-essential amino acids – These are the 11 amino acids our bodies can make on their own.
  • Essential amino acids – These are the 9 amino acids cannot be made by the body, and must be consumed in our diet.

If a food supplies all the essential amino acids we need, it’s called a complete protein. Generally, animal protein sources provide all the essential amino acids (e.g., beef, chicken, turkey, dairy, eggs, fish).

If a food lacks one or more essential amino acids, it’s called an incomplete protein. It’s the incomplete proteins in essential amino acids that are most important to replenish when you grab an energy bar or a yogurt as a snack.

Protein Isn’t New, So Why the Hype Now?

Protein isn’t a new wonder drug, but its popularity is rising due to its ability to help keep us full longer. This occurs because of its role in controlling blood sugar, fat loss and weight maintenance.

Compared to carbohydrates and fat, protein is more filling.1  Even among protein sources, data shows there is variability in perceived level of fullness between them. In a study looking at the satiety of 38 foods (i.e., whether or not they made you full), participants had their blood sugar checked at various intervals and were asked to rate their overall fullness of foods across numerous food groups. Proteins were ranked from highest satisfaction to lowest satisfaction. Fish was ranked the most satisfying.Yogurt was ranked the least satisfying (Sorry, Cam Newton. That Oikos Triple Zero Greek Nonfat Yogurt may not fill you up).

Fish is the most satisfying protein; yogurt the least.

What’s the Best Way to Consume Protein?

When choosing your sources of protein, be selective, as protein sources can be high in saturated fats or high in sodium. Aim for leaner, less processed choices.

The Zone Diet was created to assure an optimal protein-to-glycemic load balance for improved hormonal control. It’s important to focus on making sure each meal has adequate protein balanced with appropriate levels of carbohydrate and fat to help stabilize blood sugar.

For even greater hunger control, start your meal with your protein choice first, followed by carbohydrates. This will result in even better outcomes from a post-meal blood glucose and insulin response.3

How Can I Supplement My Protein?

Protein bars, shakes and powders can be used to supplement or boost your intake in meals that are lacking. Be careful not to overdo it. If you are looking for a snack, aim for around 7 to 14 grams of protein. For a meal, aim for about 25 grams of protein. The key when using bars or shakes as a replacement is to pay attention to the balance of macronutrients. For every 1 gram of fat, you generally want to consume 2 grams protein and 3 grams of carbohydrate.

For a post-workout recovery, the best time to supplement is during the first 15 to 20 minutes after the workout. This will help replenish muscle glycogen. An excellent recovery drink is 2% milk because its carbs and protein are perfectly balanced.

Don’t got milk? Our Zone Protein Powder can easily be added to whatever beverage you have on hand to help you get the ideal balance of protein to carbs. Plus, we even have several smoothie recipes with protein powder that you can enjoy.

How Can Vegetarians or Vegans Get Their Protein?

If you’re vegan, you must get your protein from plant sources such as fruits, vegetables, nuts, seeds, and grains. This requires a little more work because many of these foods are incomplete proteins, requiring you to group them together to ensure you get all the essential amino acids you need. However, there are a handful of plant sources that do contain all that your body needs:

  • Amaranth
  • Buckwheat
  • Chia
  • Hempseed
  • Quinoa
  • Soy

Because the American diet is so varied, it’s usually not a problem for vegans and vegetarians to consume all their essential amino acids over the course of the day.

Plant sources usually contain too much carbohydrate relative to their protein content to get the optimal hormonal response. While it is true that consumption of grains and seeds is kept to a minimum in the Zone, for individuals who are vegan (avoid meat or animal products), soy imitation meat products have become better in taste and can replace animal protein in virtually every Zone recipe.  Dr. Sears’ book, The Soy Zone, was written to address this.

If you are lacto-ovo vegetarian (96% of vegetarians are), then it is much easier to get your protein because you can include egg and dairy products. The protein selections are even greater when you include Zone PastaRx as your protein source.

How Much Protein Do I Need?

The amount of protein you need truly depends on your muscle mass and level of physical activity. Use the following as a general guideline:

  • Females – Need about 20 grams of low-fat protein per meal (3 Zone Blocks). To balance each meal you’ll want to add 3 blocks of carbohydrate and 3 blocks of fat.
  • Males – Need about 28 grams of low-fat protein per meal (4 Zone Foods Blocks). Then balance with 4 blocks of carbohydrate and 4 blocks of fat.

To find your personalized requirements based on your gender, size and weight, try our Body Fat Calculator, because it shares your protein requirements in the results. Also be sure to try our Zone Food Blocks tool to see how many blocks are in the foods you eat.

Protein is important regardless of your age or lifestyle. The key is consuming moderate amounts of good quality protein and a variety of types at every meal and snack balanced with low-glycemic carbohydrates. This way you can enjoy the benefits that come from key amino acids that are important for improved blood glucose control, preservation of lean body mass with loss of excess body fat, and better mood control.


  1. Paddon-Jones D1, Westman E, Mattes RD, Wolfe RR, Astrup A, Westerterp-Plantenga M. Protein, weight management, and satiety. Am J Clin Nutr. 2008 May;87(5):1558S-1561S.
  2. Holt SH1, Miller JC, Petocz P, Farmakalidis E. Eur J Clin Nutr. 1995 Sep;49(9):675-90. A satiety index of common foods.
  3. Shukla AP, Iliescu RG, Thomas CE, Aronne LJ. Food Order Has a Significant Impact on Postprandial Glucose and Insulin Levels. Diabetes Care. 2015 Jul;38(7):e98-9.


  1. Cheri

    Hi, I am just starting the Zone Diet. I try to eat as natural as possible. I make everything from scratch, that way I know what is in it. I would like to make my own pasta with a pasta machine. Are there any flours I could use for the diet?

    • Mary Perry

      Hi Cheri,
      It’s absolutely wonderful that you make everything from scratch! Unfortunately many of the flours on the market today with higher amounts of protein, compared to traditional white flour, are still too high in carbohydrates to have the right Zone balance. Should you still decide to make some pasta on your own, just remember moderation and portion control is key. Bump up your lean protein intake at the meal to account for the extra carbohydrates that would come from the pasta.

  2. Judy

    what about rice protein powder? It seems to be the only one I can eat with my restrictions. I eat normal proteins like meats, fish, chicken, but supplement with rice protein powder.

  3. Jon Boswell

    Dr. Donald Layman, an emeritus professor of nutrition at University of Illinois, and in the past, a consultant to Dr. Sears, has published extensively (peer reviewed research) relative to muscle protein synthesis (MPS), and the need to obtain adequate protein (minimum of 30 grams per meal) to maximize the full effect of MPS. His extensive research also determined the amino acid leucine is necessary at 2.5 grams to maximize full MPS.

    Dr. Layman’s research strongly indicated the need for seniors to consume adequate protein to avoid the scaropenia (muscle loss with aging). This is one his major themes as a result of his extensive research (over 80 published peer reviewed research projects in the area of nutrition).

    There is also peer reviewed research relative to the greater need for protein after resistance exercise for seniors, to maximize MPS and muscle growth. Researchers have determined that seniors benefit most from resistance training when they consume at least 40 grams of protein after lifting. Unlike young people, research indicates that the window for consuming adequate protein after resistance exercise for seniors exist for 24 hours and there is not necessarily a critical need to consume protein immediately after exercise.

    Research has indicated that as we age we need more protein. This finding does not appear to be controversial among nutritional researchers.

    I am curious that the Zone report on protein failed to address factors raised by established research with regard to the elderly and the need of adequate protein in their diet.

    Not all Zoners are young!!! I have been in the zone since 1996 and believe nutritional aspects of aging should also be a part of your agenda and the information that you share on your website for individuals who follow the zone precepts or who seeking basic knowledge about nutrition.

    Please note that at the end of 2015 there were 55 million people on Medicare and 46.3 million of those were over 65, a significant portion of the American population. There is a big audience for diet and nutrition information for seniors. Please consider us when developing and sharing future information.

    Thank you for accepting my input.

    • Mary Perry

      Hi Jon,
      Thanks so much for your comments. Dr. Sears is a big supporter of Layman’s work, however where Layman’s protein requirements are based on grams per kilogram of body weight, we base our protein requirements on an individual’s lean body mass and activity factor as found in our Body Fat Calculator. We feel this to be even more accurate since fat mass doesn’t require additional protein to be maintained.

      Unfortunately as we age, we lose muscle mass. If you ask Dr. Sears he’ll tell you that he personally has lost 13 pounds of muscle mass since he played in the National Open Volleyball Championships in 1976 (his team finishing 7th). Therefore he doesn’t need as much protein to sustain decreased muscle mass as he used to, but as Layman suggests it should be spread evenly throughout the day.

  4. Stuart

    I recently saw pasta in the store made from red lentil flour and black bean flour. They supposedly have 26 g of protein per serving. Is that protein bioavailable? How does it stack up compared to the vegetarian sources listed above? Thanks!

    • Mary Perry

      Hi Stuart,
      Even though these pastas might be higher in protein, they are much higher in carbohydrates throwing off the hormonal response and raising blood glucose levels. Since these are made with bean flours they would still need to be coupled with other protein sources to make them complete. Sometimes with higher protein pastas once made some of the protein comes out in the water so you don’t end up being able to consume it all.

      PastaRx which is patented helps delays the entry of protein into the body giving it a better chance to interact with receptors in the gut that promote satiety by sending hormonal signals directly to the brain to say stop eating. The mark of success is the number of hours of appetite suppression you get.


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