What Are Green Olives? What Are Their Benefits?

Green olives are picked before the colour turns on the tree. They are not a separate variety but the same fruit at an earlier stage. Here we look at the nutrition side: what is in them, how much is useful, and where the limit lies.

What are green olives?

The fruit is picked after reaching full size but before the colour turns. Oil accumulation is not yet complete; the fruit is firmer and the bitterness more pronounced. That bitterness comes from oleuropein, and the fruit cannot be eaten straight from the tree — brine, alkali treatment or scoring must remove it first.

How many calories?

Almost all of it comes from fat, so fruit size and brining method move the figure noticeably. The gap between green and black is small.

What are the benefits?

Monounsaturated fat. 100 grams carry 10-15 grams of fat, mostly oleic acid as in olive oil. Replacing saturated fat with monounsaturated fat contributes to maintaining normal blood cholesterol levels.

Fibre. About 3 grams per 100 — good for a fruit, and it contributes to satiety.

Vitamin E. Olives and olive oil are a notable source of alpha-tocopherol, which contributes to the protection of cells from oxidative damage.

Polyphenols. Some of the compounds behind bitterness and pungency are polyphenols. Green olives typically hold more than black, because the content falls as ripening advances — and brining time lowers it further. A bitter olive is a chemically richer olive.

Iron and copper. More evident in black olives. Absorption of plant-source iron improves alongside vitamin C.

The part that gets skipped: salt

Salt is the most overlooked line in the olive's nutrition table. Brining method and time change sodium far more than the green-black difference. For someone watching blood pressure, what matters is not the colour but how many and which brine.

How much per day?

Though it looks like a fruit on the table, nutritionally the olive sits with fatty foods. Ten olives carry roughly the energy of a teaspoon of olive oil.