Introduction

Food is fuel — but not all fuel is created equal, and the right amount varies enormously between individuals. Understanding how to calculate your calorie needs and track nutrient intake is foundational to sustainable health, whether your goal is weight loss, muscle gain, performance, or simply feeling better day to day.

Total Daily Energy Expenditure (TDEE)

Your TDEE is the total number of calories your body burns in a day. It has four components: Basal Metabolic Rate (BMR) — calories burned at complete rest (60–70% of TDEE); Non-Exercise Activity Thermogenesis (NEAT) — unconscious movement like fidgeting and walking; Thermic Effect of Food (TEF) — energy used to digest food (~10% of intake); and Exercise Activity Thermogenesis (EAT) — deliberate exercise.

Calculating Your Needs

Use the Harris-Benedict equation (built into our Calorie Calculator) to estimate BMR, then multiply by an activity factor to get TDEE. This gives your maintenance calories — the amount needed to sustain your current weight.

Key Micronutrients Often Overlooked

Iron: Essential for oxygen transport. Deficiency causes fatigue and impaired cognitive function — especially common in women of reproductive age and endurance athletes.

Magnesium: Involved in over 300 enzymatic reactions. Deficiency — common in those eating processed diets — is linked to poor sleep, muscle cramps, and elevated anxiety.

Vitamin D: More than 1 billion people are estimated to be deficient worldwide. Supports bone health, immune function, and mood regulation.

Building a Sustainable Eating Plan

  • Prioritise whole, minimally processed foods that provide micronutrients alongside calories.
  • Build meals around a protein source, then add vegetables and whole grains.
  • Eat slowly and without distraction to improve satiety signalling.
  • Prepare meals in advance to reduce reliance on convenience foods.