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Portion sizes: the numbers behind the plate
What is one portion of pasta, rice or nuts — and why do restaurant and package portions overshoot? Here is a practical number guide you can use without a scale, and when the label is still the better tool.
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Package portion vs what you actually eat
A label has two lines: energy per 100 g and energy per portion — and the package portion is often tiny: half a chocolate bar, 15 g of chips, a third of a pizza. The portion column decides what you actually log.
If you ate the whole package, the real number is usually two to five times the portion line.
Everyday numbers to remember
Cooked rice or pasta: ~100 g ≈ 130–140 kcal. Palm-sized cooked chicken, fish or meat: ~100–150 g ≈ 150–250 kcal. One cheese slice 30 g ≈ 110 kcal. A small handful of nuts 30 g ≈ 180 kcal. A tablespoon of oil or butter ≈ 90–120 kcal.
These are estimates, not measurements — but they are enough to spot a double portion.
Restaurant portions: why they overshoot
Restaurant plates often run 1.5–2 times a home portion — with bread, drinks and sauces on top. Even a salad with dressing and cheese can carry a whole meal's energy.
A photo estimate gives the starting number — accuracy comes from the correction step.
The parts nobody counts
One ladle of creamy sauce ≈ 100–150 kcal; dressing poured freely over a salad another ~100 kcal; oil in the pan another 100–200 kcal. Together they can quietly double a meal's energy without changing the plate.
These hidden add-ons are exactly what a diary shows most honestly.
How to correct a photo estimate fast
When the AI suggests portions, adjust the grams on the foods you can see — that is the single highest-impact step. Weigh something ordinary once a week (pasta, rice, cereal) to recalibrate the eye.
After a couple of weeks of calibration, most people land in a reasonable range.
The shrink-back trick
Portions creep upward over months without anyone noticing. Shrinking 10–20% at a time — a slightly smaller plate, a smaller scoop — sticks better than cutting in half.
A week in the diary shows the trend honestly: like weight, portions change slowly.
Frequently asked questions
How do I know my portion without a scale?
The hand method (palm = protein, fist = carbs) plus the everyday numbers above. Measure once with a scale to calibrate the eye — after that, eyeballing works.
Are the calories printed on restaurant menus accurate?
They are estimates too — often off by 20% or more in either direction. Use them as guides and correct in the diary.
TempoLife is a diary, not a medical device — portion and energy numbers are general estimates, not exact measurements or medical advice.
Prefer to read it?
The full written guide is above, and the original article — with its own formatting and links — is here: Portion sizes: the numbers behind the plate.
Source: TempoLife guide, last updated 2026-08-31 — read via your browser's Web Speech API · checked 2026-08-31
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