What are the downsides of green juice?

Green juice has become increasingly popular in recent years as more people look to increase their intake of fruits and vegetables. While green juice can provide important nutrients, there are some potential downsides to consider. In this article, we’ll take a comprehensive look at the pros and cons of regularly drinking green juice.


Green juice is made by juicing leafy greens like kale, spinach, and parsley along with fruits like apples, celery, cucumber, and lemon. This results in a concentrated liquid containing vitamins, minerals, and plant compounds from the veggies and fruits. Some of the proposed benefits of green juice include:

  • Increased vegetable/fruit intake
  • Weight loss
  • Detoxification
  • Improved energy
  • Better skin, hair, and nails

However, regularly replacing meals with green juice or drinking large amounts may come with some downsides. In the following sections, we’ll explore some of the potential cons of drinking green juice.

Low in protein and healthy fats

One potential downside of green juice is that it contains very little protein or fat. Here is a nutritional comparison between 16 ounces of green juice and a balanced meal:

Nutrient 16 oz Green Juice Balanced Meal
Calories 230 500
Protein 5 g 25 g
Fat 1 g 15 g
Carbs 48 g 50 g
Fiber 2 g 10 g

As you can see, the green juice is low in protein and nearly devoid of healthy fats, while the balanced meal provides more significant amounts of these important nutrients. Protein helps sustain energy, builds and repairs tissues, and plays a role in immunity and satiety. Healthy fats like omega-3s support heart health, brain function, and hormone balance. Relying on green juice alone means you’ll likely fall short on protein and fat intake for optimal health.

May be high in sugar

Some green juice recipes include a lot of fruits like apples, pineapple, oranges, or grapes. While the natural sugars in fruit provide some nutrients, drinking fruit juice separates the sugar from the fiber. This results in a rapid spike in blood sugar when consumed.

Here are the grams of sugar in some common green juice ingredients (per 1 cup chopped):

Fruit/Veggie Grams of Sugar
Apples 19
Pineapple 16
Grapes 15
Carrots 6
Celery 1.4
Spinach 0.1

To keep sugar content lower, green juices should emphasize greens over fruits. Limiting fruit-based juices to 4-8 ounces or less per day can help control your blood sugar. Excessive juice consumption may contribute to weight gain over time by spiking blood sugar and hormones.

Potential pesticide exposure

Since green juice condenses a large amount of fruits and veggies into one serving, any pesticides on the produce get concentrated as well. For example, a 16 ounce juice may contain the pesticides from 4-5 apples!

Organic produce has lower levels of pesticides, so choosing organic ingredients whenever possible is best. Make sure to thoroughly wash all produce. Peeling fruits and veggies can help decrease pesticide residues too.

Nutrient loss from juicing

Juicing strips away the skin and fiber of fruits and vegetables, resulting in some loss of nutrients:

  • Fiber loss can impact gut health and feed good bacteria.
  • The skin of produce contains antioxidants, polyphenols, and carotenoids.
  • Juicing denatures vitamin C and folate.
  • Some minerals like magnesium, phosphorus, iron, and B vitamins are reduced.

To help compensate for nutrient loss, alternate green juices with smoothies which retain fiber. Eating whole fruits and vegetables is also recommended for optimal nutrition.

Oxalate content

Green leafy vegetables like spinach, kale, chard, and beet greens are high in oxalates. Consuming high-oxalate foods may contribute to kidney stone development in prone individuals. If you’ve had kidney stones before, limit high-oxalate green juices and choose lower oxalate greens like romaine, cucumber, or celery instead.

Potential heavy metal exposure

Leafy greens and some root veggies can uptake heavy metals like lead, cadmium, and arsenic from the soil. Juicing concentrates these heavy metals if they are present in produce. Eating a wide variety of organic greens from reputable sources can minimize this risk. Anyone consuming green juice regularly may want to monitor heavy metal levels with periodic blood testing.

High cost

Pre-made green juices from juice bars or grocery stores can be quite expensive, ranging from $5-12 per 16 ounce bottle. Making juice at home can save money but requires an expensive juicer appliance. Compared to simply eating whole fruits and veggies, juices may not be the most cost-effective long-term.

Potential dental enamel erosion

The acids naturally found in fruits and vegetables may erode tooth enamel with excessive exposure. Drinking juice through a straw and avoiding swishing juice around in your mouth can help minimize contact with teeth. Be sure to rinse your mouth with water after drinking acidic juices.

Nutrition vs convenience

While green juice can seem like an easy way to pack in extra fruits and vegetables, health experts argue that eating whole produce with fiber provides greater nutritional benefits. Chewing food signals to the brain that you’re eating, improving satiety. Juice in liquid form bypasses this natural signaling and may leave you hungry. For optimal nutrition, balance whole fruits and veggies along with some green juice.

Not a long-term meal replacement

While replacing the occasional meal with green juice can provide a nutrient boost, most health experts recommend against prolonged juice fasting or using green juice as a daily meal substitute. Without adequate protein, fat, carbs, and fiber, severe calorie restriction from juice can lead to fatigue, lean muscle loss, nutrient deficiencies, and disordered eating patterns for some.

Potential dangers of improper food safety

Improperly handled produce and unpasteurized juice create an environment where bacteria like Salmonella, E. coli, and Listeria can grow. This poses a food safety hazard, especially for the elderly, pregnant women, and those with weakened immune systems. Follow proper food safety by:

  • Thoroughly washing produce
  • Avoiding wilted or damaged greens
  • Using pasteurized juice or a cold-press juicer
  • Storing juice for max 24-48 hours

High glycemic load

The glycemic index (GI) measures how quickly a food raises blood sugar. Glycemic load accounts for serving sizes. Fruit juices have very high glycemic loads since they lack fiber and flood the bloodstream with sugar rapidly.

Here are the glycemic loads of some common green juice fruits and vegetables per serving:

Produce Glycemic Load
Grapes 13
Apples 12
Carrots 5
Orange 5
Celery 0
Spinach 0

For blood sugar control, green juices should emphasize low glycemic vegetables and minimize high glycemic fruits like grapes or apples.

Potential for toxic algal blooms in greens

Algal blooms contaminated with cyanotoxins have been found in recreational waters and irrigation sources near some industrial farms. These toxins can contaminate greens like lettuce or spinach. While juicing doesn’t remove cyanotoxins, avoiding greens from contaminated growing regions can help minimize risk.

Detox claims are unproven

Some green juice brands boast of detoxifying properties or an ability to “cleanse” your system. However, the body already has its own highly sophisticated detoxification system involving the liver, kidneys, skin, lymph system, and colon. No studies prove that juice provides any special detox benefit beyond a normal balanced diet rich in fruits, veggies, fiber, and phytonutrients.

Not a magic bullet for weight loss

While replacing higher calorie foods with green juice can promote short term weight loss, juice alone has no special properties that guarantee sustained weight loss. Weight management relies on an overall healthy lifestyle involving regular exercise, calorie control, and adequate protein intake to maintain lean body mass.

Potential dangerous interactions with medications

The vitamin K content in leafy greens like kale, spinach or collards may interfere with blood thinning medications. Large doses of vitamin C from juice could cause issues for those prone to kidney stones. Beet juice can lower blood pressure, causing problems for medications like beta blockers. Speak with your doctor about possible juice interactions.

Not recommended for infants

Green juice lacks the protein, fat, and calories required to meet infants’ nutritional needs. Whole fruits and vegetables are better suited for introducing to infants. Experts recommend waiting until at least 3-5 years old before offering green juice to children.

Risk of juice cleanse side effects

Prolonged green juice cleanses lasting several days up to a few weeks may come with side effects including:

  • Headaches
  • Fatigue
  • Nausea
  • Dizziness
  • Irritability
  • Constipation
  • Hunger pangs
  • Lean muscle loss

These side effects result from calorie restriction, dehydration, lack of fiber, nutrient deficiencies, and blood sugar swings. Most health experts advise against long term juice cleanses.


When incorporated as part of a healthy diet, fresh green juice can provide a good nutrient boost on occasion. However, relying on juices alone long term or replacing too many meals with juice may lead to nutritional shortfalls and unintended consequences. Moderation and variety are key for balancing the upsides and downsides of green juices and smoothies. For most people, emphasizing whole fruits, veggies, lean proteins, healthy fats, and fiber is optimal for sustained nutrition and wellness.

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