What’s in the bottle of vinegar lying on your kitchen pantry shelf?
That bottle of vinegar sitting quietly in your kitchen has a surprisingly long history. Humans have been making vinegar for thousands of years — initially, quite possibly, by accident. Leave wine or another alcoholic liquid exposed to the right bacteria and oxygen, and alcohol is gradually transformed into acetic acid, giving vinegar its characteristic sharp taste and smell.
Today, vinegar appears in everything from salad dressings and pickles to chutneys and marinades. Apple cider vinegar, in particular, has acquired an almost medicinal reputation. It is credited online with burning fat, controlling diabetes, improving digestion and even “detoxifying” the body.
But how much of this is science, and how much is clever marketing?
What exactly is vinegar?
Vinegar is produced through fermentation. First, yeasts convert sugars into alcohol. Then acetic-acid bacteria convert much of that alcohol into acetic acid.
Most culinary vinegars contain roughly 4–8 per cent acetic acid, although concentrations vary. Acetic acid is responsible for much of vinegar’s acidity and many of the physiological effects researchers have investigated.
Vinegar is not, however, a significant source of vitamins or minerals. Think of it primarily as a flavouring and food ingredient with some interesting potential health effects — not as a nutritional supplement.
Meet the vinegar family
Apple cider vinegar (ACV) is made from fermented apple juice. Unfiltered versions may contain the cloudy substance known as the “mother” — bacteria, yeast and fermentation products. Despite numerous claims, there is little evidence that vinegar containing the mother provides major additional health benefits.
White vinegar is usually made from fermented alcohol and has a clean, strong acidity. It is excellent for pickling and cooking. Household cleaning vinegar may be considerably more concentrated and should not be consumed.
Wine vinegar, including red and white wine vinegar, retains some of the flavour compounds of the original wine and works beautifully in salads, sauces and marinades.
Balsamic vinegar traditionally comes from grape must and has a sweeter, richer flavour. Some commercial balsamic products contain concentrated grape must or other sweetening ingredients, so check the label if you are watching sugar intake.
Rice vinegar, widely used in Asian cuisines, is generally milder and slightly sweeter. Seasoned rice vinegar may contain added sugar and salt.
Malt vinegar, traditionally made from malted barley, has a distinctive robust flavour. People with coeliac disease need to be careful: malt vinegar derived from barley may not be suitable unless specifically labelled gluten-free.
Coconut vinegar is produced from coconut sap or coconut water and is popular in parts of Asia. It is often promoted as especially nutritious, but evidence that it offers exceptional health advantages over other vinegars is limited.
Then there are traditional fruit and speciality vinegars made from dates, pomegranates, sugarcane and other fermented ingredients. Their flavours differ enormously, but no single variety needs to be considered the “healthiest”.
Can vinegar help control blood sugar?
This is where the science becomes genuinely interesting.
Several clinical studies and reviews suggest that consuming vinegar with a carbohydrate-containing meal may modestly reduce the rise in blood glucose afterwards. Acetic acid may slow gastric emptying and influence carbohydrate digestion and insulin sensitivity.
That does not mean vinegar treats or reverses diabetes.
For someone taking insulin or glucose-lowering medicines, regularly consuming significant quantities of vinegar in an attempt to lower blood sugar should be discussed with their doctor. Food is not automatically harmless simply because it comes from the kitchen.
What about weight loss?
Apple cider vinegar is frequently advertised as a fat-burning shortcut. The evidence is much less impressive than the advertising.
Some small studies have reported modest reductions in body weight or appetite with regular vinegar consumption, but research remains limited and results are inconsistent. Vinegar cannot compensate for excess calories, poor diet, inadequate sleep or lack of movement.
If it helps make vegetables and salads more enjoyable, however, it can certainly form part of a healthy weight-management diet.
Does it improve digestion?
Possibly for some people, but not necessarily.
Vinegar’s acidity can influence digestion and gastric emptying, but claims that everyone needs apple cider vinegar to “increase stomach acid” are not well established.
In fact, people prone to acid reflux, gastritis, nausea or a sensitive stomach may find vinegar makes symptoms worse rather than better.
Does vinegar “detox” the body?
No special vinegar detox is necessary.
Your liver, kidneys, lungs and digestive system continually process and eliminate metabolic waste. There is no convincing evidence that drinking vinegar cleans toxins from the bloodstream or “flushes” the liver.
A splash of vinegar on your salad? Excellent. A vinegar detox programme? Save your money.
Vinegar’s underrated superpower: flavour
Perhaps vinegar’s greatest health benefit receives the least attention.
Acidity makes food taste brighter and more interesting. A squeeze of lemon or splash of vinegar can sometimes reduce the amount of salt, sugar or heavy sauces needed to make food enjoyable.
Try vinegar with roasted vegetables, beans, lentils, salads, soups, grilled paneer, fish or chicken. It can also be used in marinades and, of course, pickling.
For older adults whose sense of taste may become less sensitive, acidity can be an especially useful flavour enhancer.
A word about pickles
Vinegar itself contains very little sodium, but vinegar-based pickles may contain a great deal of salt. If you have hypertension, kidney disease or have been advised to restrict sodium, check the label rather than assuming that something preserved in vinegar is automatically healthy.
When vinegar can cause problems
More is definitely not better.
Drinking undiluted vinegar can irritate the throat and oesophagus and gradually erode tooth enamel. Large or prolonged intakes have also been associated with low potassium levels and may interact with certain medicines, including insulin and some diuretics.
Never swallow vinegar as a “shot”.
If you choose to drink diluted vinegar, keep quantities modest, dilute it well in water, and preferably consume it with food. Rinsing your mouth with plain water afterwards may also help protect your teeth; avoid brushing immediately after an acidic drink.
And never apply undiluted vinegar to the skin to remove moles, treat infections or cure fungal conditions. Acid can cause chemical burns.
Vinegar deserves a place in your kitchen — just not on a pedestal.
It can enliven food, help with preservation and may modestly improve the blood-sugar response to some meals. But apple cider vinegar is not substantially proven to be a miracle tonic, fat burner, detoxifier or cure-all.
Perhaps the healthiest way to use vinegar is also the oldest and simplest: as food.
Drizzle it over a salad. Stir it into a dressing. Add a splash to dal or soup for brightness. Use it to marinate vegetables or protein.
Sometimes good health does not come from turning an ordinary food into medicine. It comes from knowing how to use ordinary foods well.