Many plans aim for 1–1.5 litres of juice per day, plus plenty of water and unsweetened liquids adjusted to your size, activity, and tolerance.
How Many Litres Of Juice On A Juice Fast?
Short answer: start with a modest band, not a fixed quota. For most adults, 1–1.5 litres of pressed or blended 100% juice across the day strikes a workable balance between calories, sugar load, and practicality. You’ll still drink extra plain fluids—chiefly water and unsweetened tea—to meet your total hydration needs. Because bodies and goals differ, treat this as a starting point and adjust with the signals in this guide.
Why A Range Beats A Rigid Number
Whole-day needs hinge on body mass, activity, climate, and how concentrated your recipes are. One person’s 250 ml glass might deliver under 90 kcal (vegetable-led), while another’s fruit-forward pour can top 130 kcal with more free sugars. A range lets you tune intake without feeling boxed in.
Starting Daily Juice Volume (By Body Size And Activity)
The table below offers pragmatic starting points. It’s not medical advice. Shift up or down if you feel woozy, overly wired, uncomfortably full, or constantly hungry.
| Profile | Juice/Day | Tweak |
|---|---|---|
| <60 kg, low activity | ~1.0 L | Add 250 ml if you’re hungry between servings |
| 60–75 kg, low activity | 1.0–1.25 L | Favor veg-heavy blends to manage sugars |
| 75–90 kg, low activity | 1.25–1.5 L | Split into 5–6 small pours |
| >90 kg, low activity | 1.5–1.75 L | Use pulp where tolerated for fullness |
| <60 kg, moderate activity | 1.25–1.5 L | Pair each glass with water |
| 60–75 kg, moderate activity | 1.5 L | Lean on low-sugar veg juices |
| 75–90 kg, moderate activity | 1.5–1.75 L | Space pours every 2–3 hours |
| >90 kg, moderate activity | 1.75–2.0 L | Keep added fruit to 1–2 pieces per blend |
What Counts As “Juice” On A Juice Fast
For clarity, “juice” here means 100% fruit or vegetable juice—pressed, centrifuged, masticated, or blended then strained—without added sugars or syrups. Because fruit juice is rich in free sugars, it’s smarter to base the day around vegetable juices and use fruit mainly for flavor and potassium. When you run sweeter blends, shrink the serving size and chase with water. You’ll see bodies like the WHO recommend limits on free sugars, and fruit juice counts toward that budget, so keep vegetable-first blends as your default.
How Much Liquid Overall?
Your total daily fluids usually land near 2.7 litres for many women and 3.7 litres for many men (from all drinks plus the small share that foods provide). Juice is only part of that. Most fasts work well when juice supplies some calories and micronutrients, while plain water, herbal tea, and broth cover most hydration—see the CDC’s summary of the IOM fluid intake targets.
How Many Liters Of Juice On A Juice Fast: Practical Daily Targets
Use the steps below to dial in your own number. We’ll also repeat the phrase “how many litres of juice on a juice fast” in context so the topic stays crystal clear for anyone scanning.
Step 1: Pick A Baseline
Pick a spot in the 1–1.5 L band based on your size and activity from the table. If your blends skew vegetable-heavy (celery-cucumber-greens with lemon), start near the top of the band. If you favor sweeter mixes (apple-orange-carrot-beet), start near the bottom to keep free sugars in check.
Step 2: Check The Sugar Load
Fruit-forward juices can pack 20–26 g of sugar per 250 ml glass, while vegetable-first pours often carry less. Keep most glasses vegetable-led and tuck fruit into one or two pours. If your day pushes past six glasses of sweet juice, you’ll likely cross a sensible sugar limit before you know it.
Step 3: Spread The Pours
Small, steady servings work better than big gulps. Aim for 200–300 ml every two to three hours while awake. That cadence steadies energy, curbs headaches, and leaves room for plain water.
Step 4: Layer In Water
Match every glass of juice with the same amount of water or unsweetened tea. If it’s hot out or you’re active, go higher. This keeps total fluid close to your daily needs without leaning too hard on sugary juices.
Step 5: Adjust With Body Signals
Dial down volume if you feel bloated, jittery, or sleepy after a sweet pour. Dial up volume—preferably with vegetable-heavy blends—if you feel light-headed, get a thudding headache, or notice dark urine. The phrase how many litres of juice on a juice fast stays personal; let your body set the final answer.
Recipe Levers That Cut Sugar Without Losing Flavor
Lean Vegetable-First
Build a base with celery, cucumber, leafy greens, fennel, and lemon. These keep calories low and hydration high. Add a small piece of fruit for brightness rather than relying on multiple sweet fruits.
Use Bitter And Sour To Balance
Ginger, lemon, lime, and grapefruit (if it’s safe with your meds) tame sweetness and make smaller servings more satisfying.
Blend, Then Strain Lightly
Blending lets you keep a little pulp for fullness. Strain just enough for a smooth sip, not squeaky-clean clear juice.
Pinch Of Salt In Veg Blends
A tiny pinch in a tomato-or-greens mix perks up flavor and may help if you tend to headache on low-sodium days.
Calories And Sugars: What 250 Ml Actually Delivers
Numbers below are typical for 100% juices per 250 ml (about 1 cup). Recipes vary, but this gives a fair yardstick for planning.
| Juice (100%) | ~Calories/250 ml | ~Sugars/250 ml |
|---|---|---|
| Orange | 110–120 | 20–23 g |
| Apple | 110–115 | 22–24 g |
| Grape | 150–160 | 36–39 g |
| Pineapple | 130–135 | 24–26 g |
| Carrot | 90–95 | 9–11 g |
| Beet | 95–110 | 18–20 g |
| Tomato/Vegetable Blend | 45–60 | 5–8 g |
| Celery-Cucumber-Green | 35–60 | 3–8 g |
Why 1–1.5 Litres Often Works
Enough Energy Without A Sugar Bomb
At roughly 90–120 kcal per 250 ml glass, 1–1.5 L yields four to six glasses and roughly 360–720 kcal. That leaves space to add a light broth or a protein-free smoothie if your plan includes it, while keeping free sugars in a saner zone if you lean vegetable-first.
Room Left For Hydration
Since total daily fluids often target 2.7–3.7 L for many adults, limiting juice to 1–1.5 L makes it easier to drink 1.5–2 L of low- or no-calorie liquids to round out the day. People who try to “hit their fluids” only with juice usually run into nausea or energy dips.
Better Micronutrient Spread
Vegetable-heavy pours bring potassium and carotenoids with less sugar. A couple of fruit-forward glasses add vitamin C and flavor without crowding your sugar budget. Variety across the day beats repeating the same orange-apple mix over and over.
Signs You Need More Or Less
When To Nudge Up
- Persistent light-headedness between glasses
- Dark urine for several hours
- Headache that eases after a small pour
When To Nudge Down
- Bloating or reflux after sweet blends
- Energy crash 30–60 minutes after a glass
- Sticky mouth, “furry” teeth, or throbbing hunger—signs you’re pushing sugar
Hydration Mistakes That Make Fasts Harder
- Relying on fruit juice for all fluids. Pair each glass with water to reach your day’s fluid target without overshooting sugars.
- Pouring giant servings. Smaller, frequent glasses reduce spikes and dips.
- Skipping sodium entirely. A light pinch of salt in a tomato-or-vegetable blend can help if you’re prone to headaches and you’re not on a sodium-restricted plan.
- Using concentrates with added sugars. Read labels; 100% juice only.
- Forgetting temperature and climate. Hot, humid days call for extra plain fluids.
Sample One-Day Pour Schedule
This sketch keeps total juice near 1.25 L with roughly equal water alongside:
- 7:30 — 250 ml vegetable-led juice + 250 ml water
- 10:00 — 200–250 ml fruit-vegetable blend + 250 ml water
- 12:30 — 250 ml tomato/veg blend + 300 ml herbal tea
- 15:00 — 200–250 ml carrot-forward blend + 250 ml water
- 17:30 — 200–250 ml green juice + 300 ml broth or tea
Label Tips For Smarter Pours
- 100% juice only. “Drink,” “beverage,” or “nectar” often add sugar.
- Scan sugars per 250 ml. Keep sweeter options to one or two glasses.
- Watch sodium in vegetable juices. Pick low-sodium when available.
- Prefer pulp when tolerated. A touch of fiber improves fullness.
When A Higher Or Lower Volume Makes Sense
Some contexts justify stepping outside the 1–1.5 L band. Endurance training in hot weather, very tall bodies, and people accustomed to high produce intake may tolerate up to ~2 L of mostly vegetable juice, provided plain fluids are paired one-for-one and sugar-dense blends stay rare. On the other hand, smaller bodies, people with sensitive blood sugar responses, or those prone to reflux often feel better closer to 0.8–1.0 L with extra water, herbal tea, and clear broth doing the heavy hydration. The guiding rule: if energy steadies, digestion feels calm, and you’re hitting urine that’s pale straw most of the day, your volume is about right.
Who Should Skip Or Modify A Juice Fast
People with diabetes, kidney disease, gallbladder issues, eating disorders, or who are pregnant or breastfeeding should skip juice fasts or only proceed with clinician guidance. If you take medications that interact with grapefruit, avoid grapefruit juice entirely. When in doubt, choose a gentler reset—more whole produce, fewer ultra-processed foods, regular meals, and steady water.
Putting It Together
Set your volume with a realistic band—usually 1–1.5 litres of juice—then meet the rest of your fluid needs with plain water and unsweetened drinks. Build mostly vegetable-first pours, punctuate with one or two fruit-forward glasses, and adjust by how you feel. That approach answers the question of how many litres of juice on a juice fast while keeping sugar in check and hydration solid.