Fat loss

Deficits, metabolic adaptation, NEAT, cardio and how to lose fat while preserving muscle.

The calorie deficit

Losing fat requires burning more energy than you take in, consistently. A deficit of 15–25% below maintenance is usually the sweet spot: enough to make progress, without being so aggressive that it wrecks your energy, your training or your adherence.

How to apply it

• Set a moderate deficit (≈20%) and adjust it as your weight changes
• Use the Rate of weight change calculator to pin it down

Preserving muscle while cutting

To lose fat and not muscle there are three levers: high protein (2.0–2.4 g/kg or more of lean mass), continuing to train strength heavy, and not going too fast. Muscle is 'expensive' to maintain; give your body reasons (stimulus and protein) to keep it.

How to apply it

• Raise your protein in a deficit (2.0–2.4 g/kg)
• Keep your loads up: do not switch to 'light weights and high reps'

Rate of loss

Losing ~0.5–1% of your body weight per week balances speed with muscle retention. Faster increases lean mass loss, hunger and the risk of regaining it all. The leaner you are, the slower you should go.

How to apply it

• Aim for 0.5–1%/week; the leaner you are, the slower
• If you lose strength and mass fast, ease off the deficit

Metabolic adaptation

In a prolonged deficit your expenditure drops: less NEAT (spontaneous movement), hormonal adjustments (thyroid, leptin) and less weight to move. It is a normal response, not 'metabolic damage'. You manage it with patience, diet breaks and by not dragging deficits out forever.

How to apply it

• Expect progress to slow; adjust calories or activity
• Schedule diet breaks at maintenance every few weeks

NEAT: the forgotten giant

NEAT (non-exercise activity thermogenesis: walking, fidgeting, moving about) can vary by hundreds of kcal a day and usually drops in a deficit without you noticing. Keeping an eye on your daily steps is one of the most powerful and cheapest tools there is.

How to apply it

• Set a step target and hold to it while in a deficit
• Move throughout the day, not just in your session

Hunger and satiety

Hunger rises in a deficit; managing it is half the battle. Protein, fibre, bulky low-density foods (vegetables, fruit, potatoes), sleeping well and drinking water all help you eat fewer calories without extreme hunger.

How to apply it

• Prioritise protein, vegetables and foods that fill you up by volume
• Look after your sleep: sleeping too little drives appetite up

Cardio for fat loss

Cardio helps create a deficit, but it is neither essential nor magic: it does not 'burn localised fat' and sweating more does not mean losing more fat. Use it as a tool to expend energy and for cardiovascular health, combined with your diet.

How to apply it

• Add cardio to increase expenditure, not to 'make up for' meals
• Zone 2 for volume plus some high intensity; see HR zones

Plateaus and diet breaks

Stalling is normal: expenditure drops and sometimes your logging gets loose. Before cutting further, check your actual adherence. Diet breaks (1–2 weeks at maintenance) ease adaptation and mental fatigue without slowing your overall progress much.

How to apply it

• Faced with a plateau, check portions and activity before cutting further
• Use maintenance breaks to sustain long deficits

Keeping the weight off

Most people regain the weight: real success is maintenance. A gradual transition to maintenance, keeping protein high, training for strength and monitoring without obsessing. Losing is a project of months; maintaining is for life.

How to apply it

• Raise calories gradually once you reach your goal
• Keep the habits that worked for you: do not start again from scratch