Fruits and vegetables are good for health.
Some of them even help fight chronic diseases, such as heart disease and cancer.
“Juicing,” beloved to be the extract of nutrients in fruits and vegetables, has been an increasingly popular method to food intake. Many people do this in order to “detox” or add more nutrients to their diet. Supporters claim that juicing can improve nutrient absorption, while others say it strips away important nutrients like fiber.
What is Juicing?
Juicing extracts the juice from fresh fruits and vegetables. This usually strips away all the solid matter from whole fruits and vegetables, including seeds and pulp.
The resulting liquid contains most of the vitamins, minerals and antioxidants naturally present in the whole fruit or vegetable.
Juicing methods vary, from squeezing fruit by hand to the more commonly used motor-driven juicers.
Purpose of Juicing
Juicing is generally used for two different purposes:
Cleansing or detox: Solid food is eliminated and only juice is consumed as a way to cleanse your body of toxins. Juice cleanses range from 3 days to several weeks in length.
To supplement a normal diet: Fresh juice can be used as a handy supplement to your daily diet, increasing nutrient intake from fruits and vegetables that you wouldn’t otherwise consume.
Bottom Line: Juicing involves extracting and drinking the juice from fresh fruit and vegetables. Some people do this to “detox,” while others do it to supplement their current diet.
Juice is an Easy Way to Get Lots of Nutrients
Fresh Produce With Juicer
Many people don’t get enough nutrients from their diet alone.
This is largely due to processing methods and the long time it takes to get produce from the field to the supermarket. Polluted environments and high stress levels can also increase our requirements for certain nutrients.
Fruits and vegetables are full of vitamins, minerals, antioxidants and plant compounds that may protect against disease. If you find it difficult to get the recommended amount of fruits and vegetables into your diet each day, juicing can be a convenient way to increase your intake.
One study found that supplementing mixed fruit and vegetable juice over 14 weeks improved participants’ nutrient levels for beta-carotene, vitamin C, vitamin E, selenium and folate.
Bottom Line: If you struggle to eat enough fruits and vegetables each day, juicing is a convenient way to get a wide range of important nutrients.
Whole Produce Protects Against Disease, But Studies on Juice are Disappointing
Fresh Vegetable Juices
There’s plenty of evidence linking whole fruits and vegetables to reduced risk of disease, but studies for fruit and vegetable juices are harder to find.
One review reported that the health benefits of fruits and vegetables may be due to antioxidants, rather than fiber. If this is true, then juice may provide comparable health benefits to whole produce.
However, there is only weak evidence that pure fruit and vegetable juices can help fight cancer. There is a lack of human data; and other findings are inconsistent.
Nonetheless, other areas of health show more promise. For example, juices may reduce the risk of heart disease. Apple and pomegranate juices have been linked to reduced blood pressure and cholesterol levels.
Additionally, consuming fruit and vegetable in liquid form or blended concentrations may reduce homocysteine levels and markers of oxidative stress, both of which are linked to improved heart health.
Bottom Line: Limited evidence is available to link fruit and vegetable juice to a reduced risk of diseases like cancer, Alzheimer’s and heart disease.
Fruits And Veggies Are Best Consumed Whole
Juicing advocates often claim that drinking juice is better than eating whole fruits and vegetables. They justify this by saying that removing the fiber makes nutrients easier to absorb.
However, there isn’t any scientific research to support this. You may actually need the fiber content of the fruit or vegetable to experience the plant’s full health benefits.
For example, important antioxidants that are naturally bound to plant fibers are lost in the juicing process. These may play an important role in the health benefits of whole fruits and vegetables. In fact, up to 90% of fiber is removed during the juicing process, depending on the juicer. Some soluble fiber will remain, but the majority of insoluble fiber is removed.
Potential Health Benefits of Fiber
Higher fiber intakes have been associated with lower risks of heart disease, obesity and type 2 diabetes.
Studies have shown that increasing soluble fiber, in particular, may improve blood sugar and cholesterol levels.
In addition, people tend to feel more full when they eat whole fruits, compared to when they drink the juice equivalent.
Should You Add Fiber to Your Juices?
The level of fiber in your juice will depend on what type of juicer you use, but some sources suggest adding leftover pulp to other foods or drinks to increase fiber intake.
Although this is better than throwing the fiber away, evidence suggests that re-adding fiber to juice doesn’t give you the same health benefits as simply eating whole fruits and vegetables. Additionally, a study found that adding naturally occurring levels of fiber to juice did not enhance feelings of fullness.
Bottom Line: Eating whole fruit and vegetables is better for your health. Juicing makes you miss out on beneficial fiber and antioxidants.
Juicing For Weight Loss May be a Bad Idea
Many people use juicing as a way to lose weight.
Most juice “diets” involve consuming around 600–1,000 calories per day from juices only, resulting in a severe calorie deficit and fast weight loss.
However, this is very difficult to sustain for more than a few days. While juice diets may help you lose weight in the short-term, such a severe calorie restriction can slow your metabolism in the long-term. This is also likely to lead to nutrient deficiencies in the long-term, since juices lack many important nutrients.
Bottom Line: Most juicing diets involve severe calorie restriction, which is generally unsustainable in the long-term and can lead to a reduction in the amount of calories you burn.
Juices Should Not Replace Meals
Using juices as a meal replacement can be bad for your body.
This is because juice on its own is not nutritionally balanced, since it does not contain sufficient protein or fat.
Consuming enough protein throughout the day is necessary for muscle maintenance and long-term health. Additionally, healthy fats are important for sustained energy, hormone balance, cell membranes and the fat-soluble vitamins A, D, E and K.
However, replacing one meal a day with juice is unlikely to cause harm, as long as the rest of your diet is more balanced.
You can make your juice more balanced by adding protein and good fats. Some good sources are whey protein, almond milk, avocados, Greek yogurt and peanut butter.
Bottom Line: Juices are nutritionally unbalanced because they do not contain adequate protein or fat. Adding protein and fat sources to your juices can help with this.
Juice Cleanses Are Not Necessary, and May be Harmful
Consuming 100% fruit juice has been associated with an increased risk of metabolic syndrome, liver damage and obesity.
In addition, there is no evidence that your body needs to be detoxified by eliminating solid food. Your body is designed to remove toxins on its own, using the liver and kidneys.
Furthermore, if you’re juicing with non-organic vegetables, you can end up consuming other toxins that come along with them, such as pesticides.
For individuals with kidney problems, a heavy consumption of juices rich in oxalate has been linked to kidney failure. More extreme juice cleanses are associated with negative side effects such as diarrhea, nausea, dizziness and fatigue.
If you take prescription medication, you should be aware of potential drug-nutrient interactions. For example, large amounts of vitamin K found in green leafy vegetables like kale and spinach can interfere with blood thinners.
Bottom Line: There is no evidence that juice cleanses are necessary for detoxifying the body. Juicing may harm people who have kidney problems or take certain medications.
Fruit Juice Contains High Amounts of Sugar
What you put in your juice can also make a big difference, and fruits contain much more sugar and calories than vegetables. Consuming too much fructose, the naturally occurring sugar in fruit, has been linked to high blood sugar, weight gain and an increased risk of type 2 diabetes.
About 3.9 oz (114 ml) of 100% apple juice contains zero grams of fiber, but packs 13 grams of sugar and 60 calories. Similarly, 100% grape juice has 20 grams of sugar in a serving of 3.9 oz (114 ml).
To keep the sugar content of your juices low, you can juice the vegetables and then add a small piece of fruit if you want more sweetness.
Bottom Line: Juices based mainly on fruit are much higher in sugar and calories compared to vegetable-based juices.
Take Home Message
Fresh juices contain important vitamins and antioxidants that can benefit your health. However, fruits and vegetables are still the healthiest and most nutritious when consumed whole.
Source: Authority Nutrition
- Font Size
- Reading Mode