Cranberry: The Little Red Berry That Makes Researchers Curious

1. What Is It Actually?

A cranberry is a small, round berry. It is about the size of a pea, deep red on the outside, and when you cut it open you see light-coloured flesh and tiny seeds. A natural substance is something that a living being produces itself. A plant builds its own substances from water, light and air: colour, smell, taste. None of this is mixed together in a factory; the small shrub does it itself. It is the same with the cranberry. It does not contain a single substance, but a whole basket full of different substances. Some make it red, others make it sour. Researchers therefore prefer to speak of a mixture rather than the one cranberry substance. It is like a soup: many ingredients together produce the flavour, and no ingredient alone tastes like the whole soup. Because the berry is so sour, it is rarely eaten just like that. Usually it is pressed into juice or dried. Its German name is Großfrüchtige Moosbeere. “Großfrüchtig” literally means “with large fruits”.

2. Where Does It Come From?

It does not grow in the supermarket but on a shrub. The shrub is low and spreads densely over the ground. The berries hang on it like small red pearls. They ripen in autumn and are then picked and collected in baskets. Juice, jam or dried fruit is made from the berries. In English it is called cranberry, in German Großfrüchtige Moosbeere. The name “Moosbeere” indicates that it likes damp, mossy places. So when you hold a cranberry in your hand you are holding the result of an entire summer: sun, rain and a shrub that has grown its berries itself.

3. What Do Researchers Investigate?

Researchers have looked in many studies at what happens when people regularly consume cranberry. Most often the focus was on the bladder: do people who drink cranberry develop bladder infections less often? The results were not the same in all studies, so research continues. Other studies examined the urine. Some bacteria can stick to walls. Researchers investigated whether this succeeds less well after cranberry. Still other studies observed the blood vessels or substances in the blood, for example in people with heart disease. Such measurements show what is happening in the body. Whether people feel different as a result is not yet said. Much is therefore still open. Researchers continue to ask: does the amount play a role? Does juice work differently from dried berries? And is it actually due to the berry, or to the fact that people who drink a lot of cranberry also behave differently otherwise? Such questions can only be answered with new studies.

4. An Experiment to Think About

Get a glass of clear water and pour a little cranberry juice into it. Do not stir, but look closely. The red juice sinks and spreads slowly like a small red cloud. After a while the water all around is slightly pink. No single substance does this. It is many tiny colour particles that distribute themselves. Researchers work in a similar way when they examine a berry: they look at which substances can be separated and how they behave. Much can be read from a small sip; you just have to look patiently. Ask yourself: if so little juice already contains so many colour particles, how many different substances are there in the whole berry?

For adults and professionals: the Cranberry (Large-Fruited Cranberry).