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Can Juice Help You Lose Weight? The Honest Answer

Juice cleanses promise fast loss and mostly deliver water and muscle. Here is how we use juice in the Weight Management program without the crash — and the three rules that make it work.

Luis Herrera, RDNRegistered Dietitian NutritionistAugust 11, 2026 7 min read

Why juice-only cleanses backfire

A three-day juice fast typically drops 1.5–3 kg on the scale. Almost all of it is water and glycogen, with a meaningful share of lean tissue because protein intake collapses to near zero. It comes back within a week of eating normally, often with a rebound appetite that undoes the effort.

Fruit-heavy juice also delivers sugar without the fibre that would slow it down. A 500 ml apple-based juice can carry as much sugar as a soft drink — which is why we never build a weight recipe around fruit.

How juice actually helps

Used as a low-calorie, high-volume addition to a real meal, a vegetable juice does three useful things: it displaces higher-calorie drinks, it front-loads water and potassium before you eat, and — in our members' experience — it makes people more aware of what else goes into their day.

Our Weight Management recipes are built on cucumber, celery, grapefruit and ginger: roughly 90–120 kcal per glass, a little bitterness to blunt sweet cravings, and enough acidity to be genuinely refreshing.

  • Rule one: juice replaces a drink, never a meal
  • Rule two: vegetables outnumber fruit at least four to one
  • Rule three: pair every glass with protein — eggs, yoghurt, beans, fish

Grapefruit and medications

Grapefruit inhibits an enzyme that clears many drugs, including several statins and blood pressure medications. If you take any regular medication, ask the desk or your pharmacist before adding grapefruit — we can swap in lime or green apple with no loss to the recipe.

Panel takeaway

Juice is a useful tool for weight when it's mostly vegetables, sits beside a meal, and never becomes the meal.

Reviewed by the Nourishjuice nutrition panel. Wellness guidance only — not a substitute for medical advice. Discuss changes with your clinician, especially if you take medication.