Grapefruit: a refreshing citrus, its traditional uses and its cautions

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Grapefruit is a big, tangy citrus from Southeast Asia, thick-rinded and pink-fleshed, ripening in the depths of winter when little else does. This page covers what it actually contains, what herbalism and naturopathy make of the fruit, zest and seeds, how to prepare it at home — and the one thing that matters most: its interactions with medication.

Where it comes from

• Native to Southeast Asia, where the grapefruit tree still grows in Vietnam, Thailand, Indonesia, Malaysia and southern China.
• In Japan, the fruit has been used for many centuries in skin care, to cleanse and to hydrate.
• Seeds reached Barbados by the end of the 17th century, then the wider Caribbean, and Florida by 1800.
• It became a fashionable slimming fruit in the 1930s, then again with the “Hollywood diet” of the early 1980s — a reputation no study has ever supported.

Grapefruit at a glance

What it is credited with

• Herbalists describe grapefruit as antioxidant, astringent and mildly antiseptic, largely on account of its flavonoids and vitamin C.
• Naturopathy credits the juice with a tonic, anti-fatigue quality, which is why it is traditionally taken in the morning.
• Its pectin fibre gives it a long-standing reputation for supporting digestion and easing sluggish transit.
• Traditional use also attributes a diuretic quality to the juice and zest infusion.
• The zest, rich in aromatic oils, is used in folk practice as an appetite-sharpening bitter before a meal.
• In Japanese tradition, the fruit’s juice and rind have long been applied to the skin to purify and hydrate.
• Pink and red varieties are grouped by naturopaths with other pink and red fruits said to support gums, teeth and bones, thanks to their vitamin C and mineral content.
• The 1930s and 1980s slimming reputation is exactly that — a fashion, not a property. Grapefruit is simply low in sugar and filling.

How to use it

Phytotherapy uses the whole fruit: zest, membranes, pulp, seeds and even the white inner skin. Each part has its own place.

• Fresh segments. Halve the fruit, peel away the thick rind, and separate the segments. Eat them one at a time — the membranes carry most of the bitterness and most of the fibre. Half a fruit is a normal serving.
• Morning juice. Squeeze half to a whole grapefruit and drink it straight away, before breakfast, while the vitamin C is at its best. Naturopathy suggests it as a short morning habit over a week or two rather than a permanent one.
• Zest infusion. Pare thin strips of untreated rind, avoiding as much white pith as you can. Pour freshly boiled water over a small handful, cover, and leave to steep for about ten minutes. Drink after a heavy meal. Bitter, fragrant, no sugar needed.
• Dried zest. Dry strips of rind on a rack in a warm, airy spot for a few days until brittle. Crumble into rice, marinades or a winter infusion blend.
• In cooking. Grapefruit segments pair well with avocado, fennel, chicory, crab and smoked fish. A squeeze of juice replaces vinegar in a dressing.
• Seed extract. Sold ready-made as a liquid; follow the maker’s instructions to the letter and treat it as a strong preparation, not a drink.
• Skin rinse. Cooled zest infusion, dabbed on with cotton wool, is the traditional cleansing use. Rinse off; never apply before going out in the sun.

Frequently Asked Questions

The one thing to remember: if you take any regular medication, check with your pharmacist before making grapefruit a habit — then enjoy half a fruit, freshly cut, in the morning.

Is grapefruit the same thing as pomelo?

No, though they are constantly confused. Pomelo is a hybrid citrus, while grapefruit comes from Citrus maxima, both in the Rutaceae family. They look similar and are used in much the same ways in the kitchen.

Why does grapefruit interact with medication?

Compounds in the flesh and especially in the white inner rind change the way the body handles many medicines, making their effect stronger or weaker. The consequences can be serious. This is why homemade juice is preferable to commercial juice, which may contain albedo, and why a pharmacist’s opinion comes first.

When is grapefruit in season?

The clustered fruits ripen around midwinter, which is what makes grapefruit such a familiar cold-season citrus. Choose fruit that feels heavy for its size, and buy untreated if you plan to use the zest.

Can I use the zest and the white pith?

Phytotherapy uses the whole fruit — zest, membranes, pulp, inner skin and seeds. The zest makes a bitter, fragrant infusion after a meal; steep thin strips for about ten minutes in just-boiled water. Use untreated fruit only, and go easy on the white pith, which is very bitter.

Does grapefruit help you lose weight?

Its slimming reputation dates from a 1930s fashion revived by the “Hollywood diet” in the early 1980s, and no study has ever backed it up. Grapefruit is simply low in sugar, high in fibre and filling. Treat it as a good winter fruit, not a cure.

→ Also read: how to grow pomelo well

This information is provided for general interest and reflects the traditional use of plants. It is not a substitute for medical advice. If you are on medication, pregnant, or in any doubt, ask a healthcare professional.