
Flexible dieting, also known as \counting macros or IIFYM (If It Fits Your Macros), is a popular nutrition approach that allows you to eat your favourite foods while staying on a diet and losing weight. Unlike most diets, flexible dieting does not restrict certain foods or food groups and instead focuses on monitoring your macronutrient intake. To start flexible dieting, you must first calculate your total daily energy expenditure (TDEE) and macronutrient needs based on your weight, activity level, and weight loss goals. You can then use a food-tracking app to ensure that you stay within your daily calorie and macronutrient goals.
| Characteristics | Values |
|---|---|
| Purpose | Weight loss, weight gain, muscle growth, performance improvement, general health |
| Food choices | No restrictions, but macronutrient targets must be met |
| Macronutrients | Carbohydrates, proteins, fats |
| Calories | Must be within daily needs |
| Tracking | Use apps like MyFitnessPal, My Macros, My Macros+, Lose It, Carbon Diet, My Food Diary, or a food diary |
| Calculating needs | Use a macro calculator, or do it by hand |
| Fibre intake | Track this to ensure adequate micronutrient intake |
| Whole foods | 80-85% of the diet should come from nutritious whole foods |
| Meal plans | Flexible dieting websites provide these, or you can plan meals yourself |
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What You'll Learn

Calculate your TDEE (total daily energy expenditure)
To start flexible dieting, you must first calculate your total daily energy expenditure (TDEE) and macronutrient needs. TDEE is an estimate of how many calories you burn per day, taking into account your basal metabolic rate (BMR) and your activity level. BMR refers to the number of calories your body burns at rest, which accounts for 60-70% of an individual's total daily calories burned. Non-resting energy expenditure includes calories burned through exercise, daily activities, and the energy required to digest food.
There are several TDEE calculators available online that can help you determine your TDEE. These calculators use formulas that take into account various factors such as your age, gender, height, weight, and activity level. Some commonly used equations for estimating BMR include the Mifflin-St Jeor equation, the Harris-Benedict equation, and the Katch-McArdle formula. The Katch-McArdle formula is the only one that considers lean body mass. By inputting your information into one of these calculators, you can get an estimate of your TDEE.
It's important to note that TDEE is just an estimate and may vary from day to day. It also does not directly measure the total amount of calories burned per day or indicate whether you are in a healthy weight range. Body Mass Index (BMI) is a more accurate indicator of a healthy weight. Additionally, TDEE may not be suitable for children, pregnant women, or older adults.
Once you have calculated your TDEE, you can use this information to plan your flexible diet. Flexible dieting, also known as \"counting macros\" or "If It Fits Your Macros" (IIFYM), involves tracking your macronutrient intake to ensure it aligns with your specific needs and goals. There are three types of macronutrients: protein, carbohydrates, and fats. You can choose any food as long as it fits within your macronutrient needs and helps you achieve your desired body composition goal.
There are many apps and websites available to help you track your macronutrient intake and ensure it aligns with your TDEE and daily macro limits. These tools can make it easier to stick to your flexible diet plan and achieve your weight management goals.
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Determine your calorie needs
Flexible dieting is a simple and adaptable approach to eating that focuses on macronutrients (macros) and allows you to eat the foods you enjoy without banning specific foods or food groups. It is based on the concept of counting and tracking macronutrients (protein, carbohydrates, and fats) to achieve an individual's body composition and health goals.
To start flexible dieting, the first step is to determine your calorie needs. This involves calculating your total daily energy expenditure (TDEE) and macronutrient needs based on your current weight, exercise levels, and weight loss or gain goals. There are several ways to determine your calorie needs:
- Using a "macro" calculator: Many websites that promote flexible dieting offer macro calculators to help you determine your TDEE and macronutrient requirements. These calculators take into account factors such as your height, weight, activity level, and weight goals.
- Manual calculation: You can also calculate your TDEE and macronutrient needs by hand. This involves considering your resting energy expenditure (REE), which is the number of calories burned at rest, and your non-resting energy expenditure (NREE), which includes calories burned during exercise, daily activities, and digestion.
- Consulting a professional: Another option is to consult a doctor or nutritionist. They can consider your medical history, lifestyle, and goals to help create a personalized plan that you are likely to stick with.
Once you have determined your calorie needs and macronutrient breakdown, you can begin tracking your food intake. This can be done through popular food-tracking apps such as MyFitnessPal, My Macros, or Carbon Diet. These apps allow you to look up foods and portion sizes to determine their calorie and macronutrient content, making it convenient to track your meals and snacks on the go. Additionally, you can use a scale to precisely measure and track the food you consume.
It is important to note that flexible dieting is about staying within your budget of calories and macros to support your body's basic needs and overall health. While there is flexibility in food choices, it is recommended to prioritize nutrient-dense foods and use most of your calories on healthy options to ensure adequate nutrition and promote sustainable weight management.
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Understand macronutrients
Flexible dieting, also known as "counting macros" or IIFYM ("If It Fits Your Macros"), is a simple and popular weight loss plan that allows you to eat foods that fit within your specific daily macronutrient targets. This approach provides dieters with freedom and flexibility in their food choices, making it easier to stick to and helping to create a positive and healthy relationship with food.
To start flexible dieting, you must first understand macronutrients and how they apply to your specific needs and goals. Macronutrients, or "macros," are the three types of nutrients your body needs in large amounts: protein, carbohydrates, and fats. These nutrients provide calories and have various functions in the body. Proteins repair and rebuild body tissue, carbohydrates provide energy, and fats help you feel full and absorb micronutrients like vitamins.
The number of macros you should consume each day is based on several factors, including your height, weight, activity level, and weight loss goals. You can use online macro calculators or consult a doctor or nutritionist to determine your specific macro needs. These professionals will consider your medical history and goals to create a personalised plan that you're likely to stick with.
Once you know your macro targets, you can choose any food as long as it fits within those targets. Flexible dieting does not restrict any food groups or specific foods. However, it's important to make mostly healthy choices and limit less nutritious options. For example, while all types of carbohydrates are allowed, opting for carbs that are low in added sugar and high in fibre can help you stay full and eat less. Similarly, when it comes to fats, healthier options may help you feel fuller, reduce cravings, and cut down on calories.
In addition to tracking your macronutrients, some people on a flexible diet also choose to track their fibre intake to ensure they are getting enough micronutrients. The 80/20" rule is a common approach, where 80% of your diet consists of whole, nutrient-dense foods, and 20% is made up of more indulgent options that you enjoy.
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Track your food intake
Tracking your food intake is an important part of flexible dieting. This method of dieting is centred on the idea that there are no "bad foods", and any food can be eaten as long as it fits within your macronutrient needs.
To track your food intake, you must first calculate your total daily energy expenditure (TDEE) and macronutrient needs. This can be done using an online "macro" calculator, or by hand. Your TDEE is based on your current weight and exercise levels. Your macronutrient needs are based on your height, weight, activity level, and weight loss goals.
Once you have calculated your TDEE and macronutrient needs, you can start tracking your food intake. There are many ways to do this, including using a food-tracking app such as MyFitnessPal, My Macros, or Carbon Diet. These apps allow you to look up foods and portion sizes to determine their calorie and macronutrient content. You can also use a food diary to write down what you eat and drink, and calculate the calories and macronutrients manually.
When tracking your food intake, it is important to be mindful of your fibre intake to ensure you are getting enough micronutrients. It is also recommended that 80-85% of your diet comes from nutritious whole foods. This will help you stay within your macronutrient and calorie needs while still enjoying your favourite foods.
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Use apps to monitor your progress
When it comes to flexible dieting, there are many apps available to help you monitor your progress. These apps can be used to track your meals and snacks on the go, without the hassle of writing anything down.
Firstly, you should calculate your total daily energy expenditure (TDEE) and macronutrient needs before beginning the diet. This can be done using a "macro" calculator on a website or app, or by hand. Then, you can use an app to track your daily intake of macronutrients, such as MyFitnessPal, My Macros, or Lose It. These apps allow you to deduct the macronutrients you consume from your daily totals, ensuring you stay within your set goals. MyFitnessPal, for example, has a large food database, a barcode scanner, and a recipe importer, making it easy to track your food intake. It also offers a premium membership that provides access to additional features, such as detailed food analyses, workout routines, and customisation options.
Another popular app is Noom, which offers custom meal plans, weekly challenges, and access to a virtual coaching team. Noom also includes tools to track your progress and workout plans to add more activity to your daily routine. If you are looking for an app to help with meal planning, PlateJoy is a good option. It uses a questionnaire to collect details about your lifestyle, cooking habits, and dietary preferences, and then creates a custom meal plan and shopping list.
Other apps that can be used to monitor your progress include Cronometer, which tracks your intake of essential vitamins and minerals, and My Food Diary, which is recommended for beginners. These apps can help you stay on track and make progress towards your health and fitness goals.
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Frequently asked questions
Flexible dieting is a dietary approach that allows you to eat what you want while meeting your calorie and macronutrient needs. It focuses on monitoring your macronutrient intake, also known as "counting macros", to reach your health goals.
First, calculate your total daily energy expenditure (TDEE) and macronutrient needs based on your weight, activity level, and weight loss goals. You can use online calculators or do it by hand. Then, track your food intake using apps like MyFitnessPal or My Macros to ensure you meet your daily targets.
Flexible dieting allows you to eat your favourite foods without restrictions on food groups. This includes carbs, proteins, and fats. However, it's recommended to choose mostly healthy options and limit less nutritious choices.
You can use apps like MyFitnessPal or Lose It to track your macros. Every day, you start with a total amount of macros and deduct from it as you eat or drink. Over time, you'll memorise the macro content of common foods.
Flexible dieting provides freedom, flexibility, and sustainability. It allows you to enjoy your favourite meals while working towards your health and weight goals. It can also help you develop a healthier relationship with food, avoiding the "diet, binge" cycle.











































