Calorie Deficit Explained

What you will be able to do

• explain what a calorie deficit is and why weight changes from day to day.
• decide whether a calorie deficit is suitable for you, and know when to talk to your GP first.
• estimate your energy needs and understand what a safe deficit looks like under UK guidance.
• build filling, balanced meals and swaps based on the Eatwell Guide.
• read food labels and count calories roughly, for a short time, without becoming obsessed.
• track progress weekly using more than just the scales.
• handle plateaus and plan how to keep weight off.

1. 1What a calorie deficit really is

   Understand energy balance in plain English, why the scales move up and down, and which popular beliefs about calories are myths.

   • Energy in, energy out
   • Why the scales jump about
   • Myths and facts

   Weekly progress tracker

2. 2Is a calorie deficit right for you now?

   Check whether aiming for weight loss is suitable for you, understand healthy weight measures, and know when to get support instead.

   • Who this is for, and who should check first
   • Healthy weight measures: BMI and waist
   • Checking your relationship with food

   Energy needs calculatorCalorie counting quick guide

3. 3Working out a safe deficit

   Estimate your energy needs, understand what national guidance says about a safe rate of weight loss, and why crash diets backfire.

   • Estimating your energy needs
   • Choosing a safe deficit
   • Why crash diets backfire

   Energy needs calculator

4. 4Building a deficit you can live with

   Use filling foods, simple swaps and weekly planning to eat a little less without feeling hungry or deprived.

   • Foods that keep you full
   • Easy swaps that add up
   • Planning your week

   Deficit plannerCalorie counting quick guide

5. 5Counting without obsessing

   Read labels, track your food for a short time to learn where calories come from, and handle eating out and alcohol.

   • Reading food labels
   • Tracking for a while, not forever
   • Eating out, takeaways and alcohol

   Calorie counting quick guideDeficit planner

6. 6Progress, plateaus and keeping it off

   Track progress wisely, understand plateaus, use activity and sleep to support you, and move from losing weight to maintaining it.

   • Tracking progress wisely
   • Plateaus and adjusting your plan
   • From losing weight to keeping it off

   Weekly progress trackerEnergy needs calculatorDeficit planner

• CalculatorEnergy needs calculatorEstimate roughly how much energy (kcal) your body uses in a day, as a starting point for understanding a safe, modest calorie deficit.
• PlannerDeficit plannerPlan a week of filling, balanced meals with a few planned swaps, so you eat a little less without feeling hungry or deprived.
• CardsCalorie counting quick guidePocket cards that explain calories, labels, portions and the most common hidden calories, so you can count roughly without getting obsessed with numbers.
• TrackerWeekly progress trackerRecord your progress once a week, on the same day, so you can see your trend over 3 months and notice wins that are not on the scales.