Low foam production: The foam that accumulates on top of your juice is a good indicator of how much air has been whipped into your juice by the machine, and more air exposure equals more oxidation. Oxidation is a controversial topic. As Harold McGee explains in On Food and Cooking: The Science and Lore of the Kitchen, “Because juicing mixes together the contents of living cells, including active enzymes and various reactive and oxygen-sensitive substances, fresh juices are unstable and change rapidly.” So the prevailing theory among juicers is that if less oxygen is whipped into a juice, the valuable nutrients and enzymes remain more intact. But as Kohler told us, there’s not much peer-reviewed research on how or if oxidation affects the nutrient contents of your juice. “It’s all manufacturers’ data for the most part,” he said, “which I take with a grain of salt.” That said, we still prioritized machines that produced less foam, because at the very least, oxidation can cause your green juice to turn brown, and may lead to some muddy, off flavors.
Juicing allows for a tremendous amount of nutrients and enzymes to be made available to your body, which allows for a fuller more robust overall state of health. The micronutrients released during juicing are often left unused when simply eaten, being locked tightly away in the cell walls of fruits and veggies. While your digestive system can unlock some of these nutrients, many simply go to waste without first being juiced. Juicing is a great way to lose weight safely, since that you are still getting proper nutrition while still lowering overall caloric intake. With all this in mind, it’s no surprise that the popularity of juicing, and juicers, has skyrocketed in recent years. Hopefully, after reading this buyer’s guide, you’ll not only be more aware of the benefits of juicing but also in your ability to pick out the best juicer for you!
Chef Liana Green told us that a good juicer can “juice green leafy vegetables and produce a high yield from ingredients.” The most efficient juicers will squeeze your fruits and veggies dry. The centrifugal juicers averaged a speedy two minutes per glass of juice, but they also tended to be quite messy, splattering juice everywhere if we placed our own glasses beneath the juice spouts. The cold-press juicers were generally quieter and neater during juicing, leaving us with a much cleaner countertop — but they required about seven minutes to fill one glass.
Auger-style juicers, sometimes referred to as masticating or cold-press juicers, crush and mash the produce. They're typically more expensive, and can also take some getting used to as the augers can jam when grinding tough fruits and veggies. For this reason, every one we tested has a reverse button. The upside with this style is they tend to leave more healthful and fiber-rich pulp in the juice.