Weight Management
What Is BMI and How Is It Calculated?
Body Mass Index is a quick screening number based on height and weight. Here is how it is calculated, what the categories mean and where BMI falls short.
3 min read
Fitness & Nutrition Guides
Straightforward explanations of the numbers behind healthy eating and training — what they mean, how they are calculated and how to use them sensibly.
8 guides shown
Calories
How Many Calories Do You Need Per Day?
Your daily calorie needs depend on your size, age, sex and how active you are. Here is how to estimate them — and how to adjust based on real results.
3 min read
Fitness
What Is BMR?
Your Basal Metabolic Rate is the energy your body uses at rest. Learn what affects it, how it is estimated and why it is not the same as your calorie target.
3 min read
Calories
What Is TDEE?
TDEE is the total number of calories you burn in a day. Learn what it is made of, how it is calculated and how to use it to plan your eating.
2 min read
Nutrition
How Much Protein Do You Need?
Protein needs depend on your weight, activity and goals. Here is what the research says, with simple examples and food ideas.
3 min read
Macros
Understanding Macronutrients
Protein, carbohydrates and fat provide the energy in your diet. Learn what each one does, how to read the numbers and how to find a balance that suits you.
3 min read
Healthy Habits
How Much Water Should You Drink?
Is eight glasses a day right? Here is what official guidance says about daily water needs, and how to adjust for exercise and hot weather.
2 min read
Weight Management
BMI vs Body Fat Percentage
BMI is quick; body fat percentage is more detailed. Learn how they differ, when each is useful and why using both gives a better picture.
2 min read