Portion sizes have increased dramatically over the past 50 years — in restaurants, in packaged foods, in our understanding of what a normal serving looks like. The average dinner plate has grown from 23cm to 28cm in diameter since the 1960s. Restaurant portions in the UK are typically 2–3 times the size of those in many European countries. Our collective sense of "normal" has been systematically recalibrated upward, and this recalibration is one of the less discussed drivers of rising obesity rates.
Why Standard Portion Guidance Is Confusing
Official portion guidelines — 80g of vegetables counts as one of your five a day, a serving of cheese is 30g — exist for nutritional calculation purposes, not to describe how people actually eat. Translating grams into real-life visual cues is genuinely difficult, and most people have no reliable internal reference for what 30g of cheese or 100g of pasta looks like.
A more practical approach uses visual approximations: a palm-sized portion of protein, a fist of complex carbohydrates, a thumb of fat, unlimited non-starchy vegetables. These measures scale naturally with body size and are practical in any eating situation — at home, in a restaurant, at someone else's table.
Protein: How Much You Actually Need
The UK RNI (Reference Nutrient Intake) for protein is 0.75g per kilogram of body weight for sedentary adults. For a 70kg person, that's 52g daily — achievable from moderate portions of protein at each meal. However, this represents the minimum to prevent deficiency, not the optimal amount for health, satiety, or muscle maintenance.
Research suggests that adults over 40 benefit from higher protein intakes — around 1.0–1.2g per kilogram — to counteract the natural decline in muscle protein synthesis that comes with ageing. Active adults need more still. Spreading protein across meals matters: the body can only synthesise muscle protein effectively from roughly 20–40g of protein per meal, making three protein-containing meals superior to one large protein hit.
A practical portion: a chicken breast (around 150g cooked) provides approximately 40g of protein. Two eggs provide 12g. A 200g tin of tuna provides 44g. Greek yoghurt provides 15–20g per 200g serving.
Carbohydrates: Quality and Timing Over Restriction
The diet wars of recent decades have created enormous confusion about carbohydrate intake. The reality is nuanced: refined carbohydrates in large quantities are problematic; complex, fibre-rich carbohydrates are essential and beneficial. The relevant questions are about type and timing as much as quantity.
Cooked pasta, rice, or other grains swell significantly during cooking — a dried portion of 75g becomes approximately 200g cooked. Restaurant pasta portions are typically 2–3 times this amount. A practical fist-sized portion of cooked grains provides roughly 40–50g of carbohydrate, which is appropriate alongside protein and vegetables for most adults at most meals.
People who are physically active, particularly those doing regular strength training, need more carbohydrates than sedentary counterparts. Endurance athletes may need substantially more. One-size-fits-all portion guidance ignores these important individual differences.
Fat: The Most Calorie-Dense Macronutrient
Fat provides 9 calories per gram, versus 4 calories per gram for protein and carbohydrates. This means small amounts of fat add significant calories. A tablespoon of olive oil is approximately 120 calories — entirely reasonable and nutritionally valuable, but easy to overlook when pouring liberally. The solution is not to fear fat but to be conscious of it.
Practical portions: a thumb-sized portion of butter or nut butter, a palm of nuts (around 30g), a quarter of an avocado, a tablespoon of oil for cooking. These amounts provide valuable nutrition without inadvertently consuming excessive calories.
The Role of Vegetables in Portion Management
Non-starchy vegetables — leafy greens, broccoli, courgette, peppers, cucumber, celery, tomatoes, cauliflower — are so low in calories relative to their volume that portion size becomes essentially irrelevant. They provide enormous nutritional value (fibre, vitamins, minerals, phytonutrients) while adding bulk that supports satiety. Building meals around a large base of vegetables, with appropriate portions of protein and complex carbohydrates, is arguably the most practical and flexible approach to portion management available.
Eating Out: Navigating Restaurant Portions
London's restaurant portions are generally too large. Sharing dishes, ordering starters as mains, requesting half portions where possible, or simply leaving food on the plate — all of these are socially acceptable and nutritionally sensible responses to excessive restaurant servings. The cultural imperative to "finish what's on your plate" is a holdover from scarcity that has no place in an environment of surplus.
Get These Nutrients Through Vanda's Kitchen
Understanding portion sizes is the first step. The practical next step is ensuring your daily diet actually delivers the nutrients your body needs. For City of London workers, Vanda's Kitchen's freshly prepared Filipino-inspired lunch provides a genuinely nutritious alternative to the processed options that dominate the EC4 lunch scene. Our food is built around lean proteins, fresh vegetables, and complex carbohydrates — a natural source of the nutrients that portion sizes research identifies as important.
Our certified halal, 100% nut-free kitchen near St Paul's Cathedral delivers to offices across the City. Every item is freshly prepared and fully allergen-labelled. For a genuinely nutritious working lunch, see our healthy office lunch delivery guide and view our team lunch options.
For related reading, see macronutrients explained and meal planning guide. WhatsApp us or order for your team today.
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Frequently asked questions
Does using smaller plates actually reduce how much you eat?
Research consistently shows that people fill whatever container is in front of them and then eat most of what they have served. Switching from a 30cm plate to a 25cm plate reduces the natural portion size without requiring any deliberate portion counting. The effect is modest but reliable and requires no ongoing willpower.
How do portion sizes in the UK compare to NHS recommendations?
UK portions have expanded substantially since the 1990s. Many common restaurant servings for pasta or steak are double or triple the size consistent with NHS guidance. The NHS Eat Well resources and British Dietetic Association portion fact sheets both reflect this gap and provide updated reference values.
Is it better to weigh food permanently or just occasionally to recalibrate?
Permanent weighing is unnecessary and unsustainable for most people. A more practical approach is weighing portions for one week every few months to recalibrate visual estimates. Portions drift gradually toward larger sizes over time, and a periodic recalibration catches this before it becomes entrenched.
Why does eating slowly actually affect how much you consume?
Satiety hormones, particularly leptin and GLP-1, take 15 to 20 minutes to signal fullness to the brain after food is eaten. Eating quickly means a significant amount of food is consumed before this signal registers. Slowing the pace of eating allows the satiety response to catch up and reduces total intake without feeling deprived.
Do portion recommendations differ for men and women?
NHS and British Dietetic Association guidance provides general adult reference portions rather than strictly gendered ones, though energy requirements do vary by body size and activity level. The hand-based portion method self-adjusts to body size to some degree, since larger hands typically accompany larger bodies with higher energy requirements.