A glass of bright green juice looks like health in a cup, and cold press juicers have become one of the most popular kitchen upgrades for people trying to eat better. They are also expensive, and juice cleanses come with some big promises about detox and weight loss.
So we looked at what the research actually says about juice: what it does well, what it does badly, and when it can cause harm. Short version: juice is not a detox and it is not a substitute for whole fruit and vegetables, but a vegetable-heavy juice can be a useful way to get more plants into your day.
Juicing at a glance: how strong is the evidence?
- 🧹 Juice cleanses for detoxNo good evidence; your liver and kidneys do this
- 🍎 Fruit juice vs whole fruitWhole fruit wins in large studies
- Beet juice for blood pressureGood, controlled trials
- 🥬 More vegetables in your dayA real, practical benefit
- ⚠️ Long green-juice cleansesRare but real kidney risk
🧹 The detox claim
Your liver and kidneys clear waste products around the clock. There is no good evidence that a juice cleanse helps them do it better, and no clinical trial has shown that juice removes “toxins” from a healthy body. Short-term weight loss on a juice cleanse is mostly water and the result of eating very few calories, and it usually comes back.
🍎 Juice versus whole fruit
The biggest problem with juice is what gets left behind. Juicing removes most of the fiber, which slows down how fast sugar reaches your bloodstream and helps you feel full.
A large 2013 study in the BMJ followed about 187,000 adults in three long-running American cohorts. People who ate more whole fruit, especially blueberries, grapes and apples, had a lower risk of type 2 diabetes. People who drank more fruit juice had a higher risk. Swapping juice for whole fruit was linked with a lower risk.
The lesson is not that juice is poison. It is that fruit juice behaves more like a sugary drink than like fruit. That is why the smartest juices are mostly vegetables, with a little fruit for taste.
Where juice does have evidence: beets
Beetroot juice is rich in dietary nitrate, which the body turns into nitric oxide, a molecule that relaxes blood vessels. In a 2015 randomized, placebo-controlled trial in Hypertension, 64 people with high blood pressure drank 250 ml of beetroot juice or a nitrate-free placebo juice every day for four weeks. The beet juice group’s blood pressure dropped by about 8/2 mmHg in the clinic, and the effect held for the whole month.
That is a real, measurable effect, similar to what some lifestyle changes achieve. It does not replace blood pressure medicine, but it is a good reason to put beets in the juicer. If you take blood pressure medication, tell your doctor before making it a daily habit.
⚠️ The kidney risk nobody mentions
Spinach, beet greens, chard and some other leafy greens are high in oxalate. In normal portions, that is not a problem for most people. But in 2013, doctors in the American Journal of Medicine described a man who developed kidney failure from oxalate after a six-week green-juice cleanse, and reviewed similar cases. Concentrated juice delivers far more oxalate than you would ever eat in a salad.
Keep juices varied, do not live on green juice for weeks, and talk to your doctor before juicing heavily if you have kidney disease or a history of kidney stones.
⚙️ Why a cold press juicer?
There are two main types. Centrifugal juicers spin fast and are cheaper and quicker, but they are weak with leafy greens and tend to leave wetter pulp. Cold press (masticating) juicers crush produce slowly. They are quieter, handle greens and herbs much better and usually get more juice from the same produce. Claims that cold-pressed juice is dramatically more nutritious are not well supported, but the better yield on greens is a real advantage if vegetables are the point.
🏆 The 3 cold press juicers we would buy
1. Nama J2 (best overall)
The J2 is a hands-free batch juicer: you load a large hopper with chopped produce, close the lid and walk away while it feeds itself. It is strong on leafy greens and also makes nut milks and frozen-fruit sorbets. It is a big purchase, but it saves the most time, and time is what makes people quit juicing.
Best overall
Nama J2 Cold Press Juicer. Hands-free batch hopper, strong on leafy greens.
Affiliate link. We may earn a commission if you buy, at no extra cost to you. Price and availability are set by the retailer and can change.
2. Hurom H70 (easiest to clean)
Hurom is one of the original slow juicer brands. The H70 is a compact, self-feeding model with a strainer-free design, which means fewer parts to scrub, often the deciding factor between a juicer you use and one that lives in a cupboard.
Easiest to clean
Hurom H70 Cold Press Juicer. Compact, self-feeding and strainer-free.
Affiliate link. We may earn a commission if you buy, at no extra cost to you. Price and availability are set by the retailer and can change.
3. Omega Hands-Free Cold Press Juicer (best value)
If you want to try cold press juicing without spending several hundred dollars, Omega’s hands-free model has a wide-mouth hopper for whole-recipe juicing at a fraction of the price. It is not as fast or as robust as the premium machines, but it is a sensible way to find out whether the habit sticks.
Best value
Omega Hands-Free Cold Press Juicer. Wide-mouth hopper at a much lower price.
Affiliate link. We may earn a commission if you buy, at no extra cost to you. Price and availability are set by the retailer and can change.
🥤 How to juice the smart way
- Aim for about three parts vegetables to one part fruit. Cucumber, celery, beet, carrot and a little apple or lemon is a classic.
- Drink juice with a meal, not instead of one.
- Keep portions to one glass, about 8 to 12 ounces.
- Use the pulp in soups, muffins or veggie burgers to get some fiber back.
- Rotate your greens to keep oxalate in check.
- Drink it fresh, or refrigerate it in a sealed jar and finish it within a day or two.
Frequently asked questions
Is cold-pressed juice more nutritious than juice from a centrifugal juicer?
The difference in vitamins is smaller than marketing suggests. The bigger practical advantage of a cold press juicer is that it gets much more juice out of leafy greens and herbs.
Can I juice every day?
One glass of mostly vegetable juice with a meal is fine for most healthy people. Rotate your greens, and talk to your doctor first if you have kidney disease, take blood thinners (leafy greens are high in vitamin K) or have diabetes.
Should I buy bottled cold-pressed juice instead?
It works, but it is expensive, and many bottled juices are mostly fruit. Read the label and look for vegetables listed first.
The honest bottom line
Juice is not a detox, and fruit juice behaves more like a sugary drink than like fruit. But a vegetable-heavy juice can help you eat more plants, and beet juice has real evidence for lowering blood pressure. Avoid long green-juice cleanses, especially if you have kidney problems. If you want a cold press juicer, the Nama J2 is our top pick, the Hurom H70 is the easiest to clean, and the Omega is the best way to start on a budget.
Studies and sources
- Muraki I et al. (2013). Fruit consumption and risk of type 2 diabetes: results from three prospective longitudinal cohort studies. BMJ, via PubMed.
- Kapil V et al. (2015). Dietary nitrate provides sustained blood pressure lowering in hypertensive patients. Hypertension, via PubMed.
- Getting JE et al. (2013). Oxalate nephropathy due to “juicing”: case report and review. American Journal of Medicine, via PubMed.
This article is for general education and is not medical advice. Talk to your doctor or pharmacist before starting a supplement, especially if you take medication or have a health condition. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
