The Zone Diet instructs its followers to stick to eating a specific ratio of 40% carbs, 30% protein and 30% fat.
As part of the diet, carbs should have a low glycemic index, which means they provide a slow release of sugar into the blood to keep you fuller for longer. Protein should be lean and fat should be mostly monounsaturated.
The Zone Diet was developed more than 30 years ago by Dr. Barry Sears, an American biochemist. His best-selling book The Zone was published in 1995.
Dr. Sears developed this diet after losing family members to early deaths from heart attacks, and felt that he was at risk unless he found a way to fight it.
The Zone Diet claims to reduce the inflammation in your body. Dr. Sears proposed inflammation was the reason people gain weight, become sick and age faster.
Proponents of the diet claim that once you reduce inflammation, you will lose fat at the fastest rate possible, slow down aging, reduce your risk of chronic disease and improve your performance.
The Zone Diet has no specific phases and is designed to be followed for a lifetime.
There are two ways to follow the Zone Diet: the hand-eye method, or using Zone food blocks.
Most people start with the hand-eye method and progress to using Zone food blocks later, since it is more advanced. You can switch between both methods whenever you feel like, since they each have their own benefits.
The hand-eye method is the easiest way to start the Zone Diet.
As the name suggests, your hand and eye are the only tools you need to get started, although wearing a watch is also recommended to keep an eye on when to eat.
In this method, your hand takes on several uses. You use it to determine your portion sizes. Your five fingers remind you to eat five times a day and never go without food for five hours.
Meanwhile, you use your eye to estimate portions on your plate. To design a Zone-friendly plate, you need to first divide your plate into thirds.
The hand-eye method is designed to be a simple way for a beginner to follow the Zone Diet.
It is also flexible and allows you to eat out at restaurants while on the Zone Diet, by using your hand and eyes as tools to choose options that fit Zone recommendations.
You can learn more about eating out on this diet.
Zone food blocks are designed to personalize the Zone Diet to your body by calculating how many grams of protein, carbs and fat you can have per day.
The number of Zone blocks you should eat per day depends on your weight, height, waist and hip measurements. You can calculate your number.
The average male eats 14 Zone blocks per day, while the average female eats 11 Zone blocks per day.
A main meal such as breakfast, lunch or dinner contains three to five Zone blocks, while a snack always contains one Zone block.
Each Zone block is made of a protein block, a fat block and a carb block.
Here is a detailed guide with different options and how much of each food option is needed to make a protein block, carb block or fat block.
A lot of the favorable Zone Diet food choices are similar to those of the Mediterranean Diet, which is one of the healthiest diets on the planet.
In fact, the creator of the Zone Diet has recently released a new book called The Mediterranean Zone, in which he covers the similarities and benefits of the two diets.
Protein options in the Zone Diet should be lean. Good options include:
The Zone Diet encourages choosing a type of monounsaturated fat. Good options include:
The Zone Diet encourages its followers to choose vegetables with a low glycemic index and a little fruit.
Good options include:
Nothing is strictly banned on the Zone Diet. However, certain food choices are considered unfavorable because they promote inflammation.
Here is a sample block meal plan with 14 food blocks, for the average man.
Breakfast (4 food blocks): Scrambled eggs with turkey bacon, vegetables and fruit.
Lunch (4 food blocks): Grilled chicken and egg salad with fruit.
Mid-Afternoon Snack (1 food block): Boiled egg, nuts and fruit.
Dinner (4 food blocks): Grilled salmon, lettuce and sweet potatoes.
Pre-Bedtime Snack (1 food block): Cottage cheese, nuts and fruit.
Here is a sample block meal plan for the average female, with 11 food blocks.
Breakfast (3 food blocks): Scrambled eggs with turkey bacon and fruit.
Lunch (3 food blocks): Grilled chicken and egg salad with fruit.
Mid-Afternoon Snack (1 food block) Boiled egg, nuts and fruit.
Dinner (3 food blocks) Grilled salmon, lettuce and sweet potatoes.
Pre-Bedtime Snack (1 food block): Cottage cheese, nuts and fruit.
The Zone Diet claims to optimize your hormones to allow your body to enter a state called “the Zone.”
This is where your body is optimized to control inflammation from your diet.
The purported benefits of being in “the Zone” are:
Dr. Sears recommends testing three blood values to determine whether you are in “the Zone.”
This is the ratio of “bad” fats known as triglycerides to “good” HDL cholesterol in your blood. A lower value means you have more good cholesterol, which is healthier.
The Zone Diet recommends less than 1 as a good value, which is low. A high number for your TG/HDL ratio increases your risk of heart disease.
Your ratio for TG/HDL must be tested by a health care professional, such as your doctor.
This is the ratio of omega-6 to omega-3 fats in your body. A lower value means you have more omega-3 fat in your blood, which is anti-inflammatory.
The Zone Diet recommends a value between 1.5–3, which is low. A high number for your AA/EPA ratio is linked with a higher risk of depression, obesity and other chronic diseases.
You can test your ratio for AA/EPA at home with a kit purchased on the Zone Diet website.
This is the average amount of sugar bound to your red blood cells over three months. A lower value means you have less sugar in your blood.
The Zone Diet recommends a value of less than 5%, which is low. A higher HbA1c is linked to a higher risk of diabetes.
Your HbA1c must be tested by a health care professional, such as your doctor.
The Zone Diet recommends that you take omega-3 supplements, such as fish oil, to maximize health benefits. They decrease the “bad” LDL cholesterol in your body, and may reduce your risk of other chronic health diseases.
The Zone Diet also recommends taking polyphenol supplements, which are molecules found in plants that have antioxidant properties.
The evidence behind polyphenols is mixed and although they may provide health benefits such as reducing the risk of heart disease, they also have risks such as decreasing your iron absorption.
Following the Zone Diet has many benefits.
Unlike other diets, the Zone Diet does not strictly restrict any food choices.
However, it does recommend against options that are unfavorable, such as added sugar and processed foods.
This can make the Zone Diet more appealing than other diets for people who struggle with food restrictions.
The recommended food choices for the Zone Diet are quite similar to the Mediterranean Diet. The Mediterranean Diet is supported by evidence as being one of the best for your long-term health.
The Zone Diet also provides you with flexibility, since there are two methods of following the diet.
The Zone Food Block method can also help fat loss because it controls how many calories you eat per day. It is well known that controlling your calorie intake helps with weight loss.
If you want to find out how many calories you need to eat per day to maintain and lose weight, you can find out.