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To lose weight, you need to eat fewer calories than you burn. In theory, this sounds simple. However, calorie counting is one way to tackle this problem.

What Are Calories?

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Bottom Line:

A calorie is a measure of energy. In science, it’s defined as the amount of energy required to raise the temperature of 1 kilogram of water by 1 degree Celsius.

Why Calories Count

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Bottom Line:

When you eat more calories than you burn, you gain weight. Counting calories can help you eat fewer calories and lose weight.

How Many Calories Should You Eat?

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Bottom Line:

The exact amount of calories you need will depend on a number of different factors, including your gender, age, weight and activity levels. Use the calculator above to work out your daily requirement.

The Best Apps to Help You Count Calories

1213The 5 Best Calorie Counter Websites and Apps
Bottom Line:

Using an app or online tool to record your meals and track your food intake is a very easy way to count calories.

How to Weigh and Measure Your Portions

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  • Scales: The most accurate way to determine how much you’re eating is to weigh your food. However, this can be time-consuming and isn’t always practical.
  • Measuring cups: Standard volume measures are slightly quicker and easier to use than a scale, but can still be time-consuming and awkward at times.
  • Comparisons: Using comparisons to common items is quick and easy, especially if you’re away from home. However, it’s also much less accurate.
  • 1 serving of rice or pasta (1/2 a cup): a computer mouse or rounded handful.
  • 1 serving of meat (3 oz): a deck of cards.
  • 1 serving of fish (3 oz): a check book.
  • 1 serving of cheese (1.5 oz): a lipstick or the size of your thumb.
  • 1 serving of fresh fruit (1/2 cup): a tennis ball.
  • 1 serving of green leafy vegetables (1 cup): a baseball.
  • 1 serving of vegetables (1/2 a cup): a computer mouse.
  • 1 teaspoon of olive oil: 1 fingertip.
  • 2 tablespoons of peanut butter: a ping pong ball.
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Bottom Line:

You can use scales, cups and measures or portion-size estimates to determine how much you’re eating. Scales are the most accurate.

The Quality of Your Diet Still Matters

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Bottom Line:

Basing your diet on minimally processed foods is beneficial for long-term health and weight loss.

5 More Tips to Succeed With Calorie Counting

  • Be prepared: Before you start, get a calorie counting app or online tool, decide how you will measure or estimate portions and make a meal plan.
  • Read food labels: Food labels contain lots of useful information for calorie counting. Make sure you check the portion size recommended on the package.
  • Remove temptation: Get rid of the junk food in your house. This will help you choose healthier snacks and make it easier to hit your targets.
  • Aim for slow, steady weight loss: Don’t cut calories too low. Although you’ll lose weight faster, you may feel bad and be less likely to stick to your plan.
  • Fuel your exercise: The most successful weight loss programs include both diet and exercise. Make sure to eat enough to still have energy to exercise.
Bottom Line:

Aim for slow and steady weight loss, and make sure you have a plan. Reading food labels and keeping less junk food in the house can also be helpful for success.

Should You Count Calories?

Calories in, calories out