TempoLife › Features › Calorie needs by life stage › desk-worker

Desk workers: calorie and protein needs

A desk job does not change the equation; it changes the multiplier. And the multiplier is doing more work than most people expect — the gap between a sedentary and an active day is bigger than the gap between most people's body weights.

General information only, not medical advice and not a diagnosis. These are population reference values; a doctor or registered dietitian is the person who turns them into something specific to you.

Training loadWomen and menReference age 40

The physical activity level, or PAL, is the ratio between total daily energy expenditure and basal metabolic rate. WHO/FAO and EFSA use it as the bridge between a resting figure and a real day. A desk job with no planned exercise sits at roughly 1.4. Someone doing physical work or training most days sits at 1.8 to 2.0. For a 75 kg adult, the distance between those two is in the region of 700-900 kcal a day — larger than almost any dietary change people attempt.

That has a specific consequence for desk workers: the energy budget is small, so its composition matters more. There is simply less room for foods that carry energy and nothing else before the protein, fibre and micronutrient columns start missing. This is the mechanism behind the common experience of eating "not much" and still not getting the nutrients — the budget is genuinely tight.

The second consequence is that unstructured movement — walking to a further coffee shop, taking stairs, standing calls, a lunchtime loop — has an outsized effect, because it changes the multiplier rather than adding a one-off. Thirty minutes of walking a day moves a sedentary PAL measurably. A single hard gym session a week does not.

The step target most people know is the obvious lever. It is worth knowing that the widely quoted round number came from a marketing campaign rather than a study, and that research since has generally found benefits accumulating well below it. Any sustained increase over your own current baseline is the part that matters.

The adjustment for this stage

No addition — a desk job sets a low physical activity level, and the whole story is in that multiplier.

PAL 1.4 is the sedentary/low-activity level in the WHO/FAO and EFSA framework: a desk job with little or no planned exercise.

Source: Human energy requirements — Joint FAO/WHO/UNU Expert Consultation (physical activity level framework) · checked 2026-09-02

The equation this page uses

BMR (men)   = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
BMR (women) = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Daily target = BMR × 1.40

Worked through for the middle row of the table below: a woman of 80 kg and 178 cm at age 40 has a Mifflin-St Jeor BMR of about 1 552 kcal. Multiplied by PAL 1.40 that is 2 172 kcal, which is the daily estimate.

Worked example: by height and weight

Worked example: how age moves it

What changes if your activity is different

Protein for this stage

EFSA's adult population reference intake is 0.83 g per kg of body weight a day. The upper figure here is not a requirement — it is the level often used when someone is trying to hold on to muscle inside a small energy budget.

Source: Human energy requirements — Joint FAO/WHO/UNU Expert Consultation (physical activity level framework) · checked 2026-09-02

Your own numbers

The nutrients that matter most here

• Protein. A smaller energy budget makes protein harder to reach by accident, which is why it moves up the priority list for sedentary workers rather than down.
• Fibre. Usually the first casualty of convenience eating, and the one most visible in a food diary within a week.
• Vitamin D. Indoor work plus a northern winter means effectively no skin synthesis for months.
• Magnesium. Whole grains, nuts, seeds and legumes dominate the USDA rankings — the same foods that carry the fibre.
• Potassium. Tracks vegetable and fruit intake closely, which makes it a decent proxy for whether the diet has any plants in it.

Source: EFSA Dietary Reference Values — energy, protein and micronutrients (European Food Safety Authority) · checked 2026-09-02

Nutrient reference values are population figures. This page never tells you to take a supplement or how much of one to take — that is a decision for a clinician who can see your blood work and your medicines.

What to actually do

• Raise the floor of the day, not the ceiling: a daily walk beats one hard weekly session for the multiplier.
• Protect protein and fibre first, because the budget is too small to reach them by accident.
• Use a step baseline of your own rather than a round target from a campaign.
• Watch drinks. Liquid energy is the most common way a tight budget quietly overruns.

Frequently asked questions

Other life stages

All life stages · TDEE calculator · Macro split · Exercise library · Nutrient toplists