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A small glass of fresh vegetable and fruit juice beside the whole produce used to make it
Reviewed September 2026
Juicing For Health and Healing

Fruit juice and smoothies: useful food, not a detox treatment

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Juice can contribute flavour and nutrients, but removing or breaking down the structure of fruit changes how easy it is to consume sugar and how much fibre remains. It does not cleanse organs, cure disease or compensate for an otherwise unbalanced diet.

Whole fruit does more work

Chewing whole fruit slows eating and retains the full fibre structure. Juice leaves much of the insoluble fibre behind. Smoothies may retain more, but large portions still make it easy to consume several fruits quickly. Spanish and UK public-health guidance therefore treat juice and smoothies as limited portions rather than unlimited drinks.

Vegetable-heavy does not mean risk-free

Adding leafy vegetables can reduce the proportion of fruit, but it does not turn a drink into medicine. People with kidney disease, diabetes, swallowing problems or medicine interactions may need individual advice. Grapefruit can interact with several medicines. Ask a pharmacist or clinician about the actual ingredients.

Prepare it safely

  • Wash hands, produce and equipment before use.
  • Cut away damaged or mouldy areas and avoid unpasteurised juice for people at higher infection risk.
  • Drink freshly prepared juice promptly or refrigerate it in a clean covered container.
  • Never use bitter apricot kernels or other unverified "detox" additions.

A practical place in the diet

Use a small glass with a meal, not as a day-long replacement for food. Water remains the routine drink. A varied diet with vegetables, pulses, whole grains, fruit and appropriate protein provides what a juice-only plan cannot.

Frequent sipping also exposes teeth repeatedly to sugar and acid. Drink the portion with a meal, avoid holding it in the mouth and wait before brushing immediately after an acidic drink. A straw does not turn a large sugary drink into a neutral one.

Sources and review

This guide was reviewed in September 2026 using the Spanish food-safety agency's nutrition and healthy-habits publications and the NHS guidance on juice, smoothies and five-a-day portions.