How many calories in a salad? The dressing is the meal

There is no such thing as the calorie count of a salad, because a salad is not a food. It is a bowl with an unlimited number of other foods in it, and the leaves are the only part everybody agrees on.

A hundred grams of mixed leaves is about 20 calories. That is roughly a tenth of a slice of bread. Whatever a salad turns out to cost, the leaves did not do it.

What is less obvious, and much more useful, is that the wrong salad does not just carry more calories. It can make the whole meal bigger.

The quick answer

Start with the part that is genuinely free.

The trial that inverts the advice

The standard advice is to eat a salad before a meal. It is good advice in exactly one form and actively counterproductive in another, and there is a clean randomised crossover trial that separates the two.

Forty-two women ate lunch in a laboratory once a week for seven weeks. Each week they were given a compulsory first-course salad, or no salad, followed by as much pasta as they wanted. The salads varied in energy density and portion size. The results, from Rolls, Roe and Meengs (2004, J Am Diet Assoc):

Read the bottom two rows again. A dressed, cheesed salad before a meal did not merely add its own calories on top. It raised the total for the whole lunch by up to 17%, meaning the pasta afterwards was not reduced enough to pay for it, and in some conditions was barely reduced at all.

The energy density in that study was manipulated by changing the amount and type of dressing and cheese. Nothing else. Same leaves, same bowl, opposite result.

So the useful version of "eat a salad first" is: eat a large salad of low-density food first. A big bowl of undressed leaves works. A small bowl of Caesar makes things worse than skipping it.

The false friend, and salad vocabulary is full of them

Two of these are genuine inversions, where the same word names a different plant in each country.

The chicory and endive pair is the sharpest one on this site so far, because the two words are swapped rather than merely different. A UK recipe calling for chicory and a US shopper buying chicory end up with two different vegetables.

None of them changes the calorie count much. All of them change what you put in the bowl.

Where the calories actually come from

Per the amount that goes on one salad, not per 100g.

And then the dressing, which is where most salads are decided.

Assembled salads

The classic Caesar deserves unpacking, because it is the salad most people picture when they say salad.

The lettuce is 2.6% of the plate. The dressing alone is 46%. If you removed every leaf from a chicken Caesar and ate only the parts that are not vegetables, you would still have 639 of the 656 calories.

Salad against the food it replaced

This is the comparison the menu is designed to prevent you making.

Ordering the chicken Caesar instead of the Big Mac is a decision that costs 166 calories, in the direction nobody expects. That does not make the burger a better food. It makes "I had a salad" a statement with no calorie information in it whatsoever.

The full-fat dressing question, honestly

There is a real argument for fat on a salad and it is not a rationalisation.

Carotenoids, the pigments in tomatoes, carrots and dark leaves, are fat-soluble. A controlled trial published in the American Journal of Clinical Nutrition (2004) fed the same salad with full-fat, reduced-fat and fat-free dressing, and found absorption of alpha-carotene, beta-carotene and lycopene was substantially higher with the full-fat version. With the fat-free dressing, absorption was negligible.

So a fat-free salad is a slightly less nutritious salad. The honest resolution is small:

One teaspoon of oil buys the absorption benefit. Everything above that is buying flavour, which is a fine thing to buy, but it should be counted as flavour rather than nutrition. The olive oil breakdown has the per-spoon arithmetic.

Salad mistakes to avoid

Logging the salad and not the dressing

The single largest error, worth 150 to 300 kcal. The dressing arrives already on the leaves in a restaurant, so it never registers as a separate item, and it is usually the biggest number on the plate.

Assuming a shop salad pot is a light lunch

Supermarket salad pots run 300 to 500 kcal, because they are built around grains, seeds, cheese or a dressing sachet. A "super seed" pot at 420 kcal is a legitimate lunch and it is not a light one. Check the pack, not the picture.

Calling coleslaw, potato salad and pasta salad salads

They are mayonnaise products at 150 to 190 kcal per 100g, roughly ten times a leafy salad. A serving spoon of each on a plate is 300 calories that arrived under the word "salad."

Adding avocado, seeds, nuts and oil to the same bowl

Each is defensible alone. Together they are 120 plus 90 plus 133 plus 248, which is 591 calories of add-ons on top of 30 calories of leaves. The word for that bowl is dinner.

Eating a small heavy salad before a meal

This is the one the trial above rules on. A small high-density first course made total intake worse, not better. If you are using a salad as a preload, it needs to be large and it needs to be plain.

Buying "light" dressing and pouring more of it

Light dressings are typically half the calories and get used at roughly double the volume, because they are thinner and taste weaker. Measure it into a spoon once and see what your normal pour actually is.

Three salads worth building

The preload that actually works (34 kcal)

• 150g mixed leaves, cucumber, tomato (30 kcal)
• Balsamic vinegar and black pepper, no oil (4 kcal)

Adds up to: 34 kcal. This is the exact shape the trial found cut total lunch intake by 12%: large portion, low density. Eat it before the meal, not with it. It works because it is boring, which is the part nobody wants to hear.

The salad that is a real lunch (392 kcal)

• 150g leaves, tomato, cucumber, red onion (38 kcal)
• 120g grilled chicken breast (198 kcal)
• 1 boiled egg (70 kcal)
• 1 tsp olive oil, lemon, mustard, vinegar (45 kcal)
• 30g chickpeas (49 kcal)

Adds up to: 400 kcal with 45g of protein, which is more protein than most 700 kcal restaurant salads. The teaspoon of oil is there for the carotenoids, not the flavour, and the mustard does the flavour work.

The Greek salad, corrected (312 kcal)

• 200g tomato, cucumber, pepper, red onion (48 kcal)
• 40g feta rather than 80g (106 kcal)
• 30g olives (45 kcal)
• 1 tbsp olive oil rather than 2, with oregano and red wine vinegar (124 kcal)

Adds up to: 323 kcal, against 578 for the standard build. Halving the feta and the oil takes 255 calories out of a dish that still reads and tastes as a Greek salad. The cheese breakdown explains why crumbling finer lets you use less without noticing.

The verdict

A bowl of leaves is 30 calories and a restaurant chicken Caesar is 659. The 629 in between is dressing, cheese, croutons and oil, in roughly that order.

The dressing is the meal. Four tablespoons of Caesar is 300 calories on a plate whose vegetables cost 30, and the tablespoon on the label is a unit almost nobody uses.

And the advice to eat a salad first is only correct for one kind of salad. Large and plain cuts total intake by up to 12%. Small and dressed raises it by up to 17%. There is no neutral setting.

Pairs well with: high-volume, low-calorie foods, how many calories are in mayonnaise, and judging portion sizes without a scale.