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LIFESTYLE › HEALTH
PUBLISHED : Tuesday, 15 April, 2014, 10:25amUPDATED : Tuesday, 15 April, 2014, 12:05pm
Nan-Hie [email protected]
Jury still out on the benefits of slow juicersSlow juicing is becoming more popular amid claims that high-speed processing destroysnutrients in the food. But some health experts aren't swallowing it, writes Nan-Hie In
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If drinking juice isso healthy, why arethey in my clinicwith high bloodsugar?CHARMAIN TAN, REGISTERED
Jury still out on the benefits of slow juicers
Freshly squeezed juice is no doubt healthier than store-bought varieties withadded sugar. But some health foodies claim that putting juicing in the slowlane is even more nutritious.
This is done by picking the right machine: masticating juicers that virtually"chew" fruits and vegetables at low speeds to tease out the nectar.
Slow juicing is becoming more popular, and an increasing number of juicermodels with lower revolutions per minute (rpm) are appearing on the market.The bottles of liquid from juice detox companies Be-juiced Hong Kong andThe Genie Concept, for example, have been extracted this way.
Erica Fong, health blogger athealthyhongkong.wordpress.com is aconvert. Since getting her own slow juicer,she no longer gets fast-whizzed juices fromstreet vendors in Central. "It's a hugedifference to not have greenish or greyishfoam on top of the juice, which I don't getfrom the fresh juices I make at home now,"she says.
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DIETITIAN Traditional juicers, or the centrifugal kind, usefast-spinning grinding blades to tear apartproduce. Compared to slow juicers, which operate at about 80 to 200 rpm,traditional juicers operate from about 3,500 rpm to more than 10,000 rpm.This generates heat and exposes ingredients to the air, both of which aresaid to kill nutrients and neutralise temperature-sensitive enzymes.
A video posted last year on popular website tested.com that pits a centrifugaljuicer against a masticating juicer shows visual proof of the difference in thefinal product: the juice from a centrifugal model has a layer of froth, indicatingoxidation, and the pulp tends to be wetter, indicating more waste.
Juice from a masticating model is said to be "cold-pressed", since it'sproduced without added heat. Green leafy vegetables and wheatgrass tendto do better using these juicers, and some models even process nuts andsoy, doubling up as a machine to make all-natural nut butters, baby food, soyand almond milk, and other healthy snacks.
Brian Ku, founder of health food store Green Vitamin, says since he starteddrinking cold-pressed wheatgrass daily two years ago, his energy levels haverisen and he can't remember when he last got the flu.
But some health experts aren't swallowing claims that slow juicing producesmore nutritious drinks.
"Yes, high speeds may generate heat that may destroy some nutrients suchas vitamin C, [but] air and light can also destroy vitamin C," says ProfessorMichael Hui King-man, chairman of the Consumer Council's publicity andcommunity relations committee.
The academic was part of a team that produced a report last year whichexamined a dozen blenders and juicers in the market. They found the healthpromises made by five models questionable, including those that claim toproduce juice that promotes faster and better nutrient absorption comparedto having whole fruits and vegetables.
"According to health care professionals, consumption of fresh fruit andvegetables reduces the risk of heart disease, hypertension and certaincancers. However, they are not aware of any scientific evidence whichdemonstrates that processing fruit and vegetables by a blender or juicerwould enhance these health effects," says Hui. Also, faster and better
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would enhance these health effects," says Hui. Also, faster and betternutrient absorption isn't a good thing for everyone. "Dietitians warn that fastabsorption of sugars from food or juice may lead to a rapid rise in bloodsugar, which is undesirable to diabetes patients," says Hui.
Registered dietitian Charmain Tan of Seventeen Nutritional Consultants saysalmost all her clients drink fresh juice daily. "But if drinking juice is so healthy,why have they ended up in my clinic with high blood sugar or overweightproblems?" she says.
Tan adds that juice drinkers may be missing out on fibre, which is strippedfrom whole produce that's juiced. "Fibre helps to maintain satiety, lowercholesterol and glucose levels and prevent constipation," says Tan, addingthat the recommended intake is at least 25 grams daily.
This article appeared in the South China Morning Post print edition as Pulpfriction
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