By Kerri-Ann Jennings
Whether you prefer white or red wine is generally a matter of taste.
But if you want the healthiest pick, which should you choose?
Red wine has drawn lots of attention for its research-backed potential to lower the risk of heart disease and lengthen your lifespan.
Does white wine have the same benefits?
This article will review what you need to know about red and white wine—how they're made, what to watch out for and which is healthier.
What Is Wine?
Wine is made from fermented grape juice.
Grapes are picked, crushed and placed in buckets or vats to ferment. The process of fermentation turns the natural sugars in the grape juice into alcohol.
Fermentation can occur naturally, but sometimes winemakers add yeast to help control the process.
The crushed grapes are put through a press, which removes the skins and other sediment. Whether this step is done before or after fermentation determines whether the wine becomes red or white.
To make white wine, grapes are pressed before fermentation. Red wine is pressed after fermentation.
After this step, the wine is aged in stainless steel or oak barrels until it's ready to be bottled.
Summary: Wine is made from fermented grape juice. The grapes are picked, crushed and then allowed to ferment in buckets or vats.
What's the Difference Between Red and White Wine?
The main difference between white and red wine has to do with whether the grape juice is fermented with the grape skins.
To make white wine, grapes are pressed and skins, seeds and stems are removed before fermentation.
However, to make red wine, the crushed grapes are transferred to vats directly and they ferment with the skin, seeds and stems. The grape skins lend the wine its pigment, as well as many of the distinctive health compounds found in red wine.
As a result of steeping with the grape skins, red wine is particularly rich in plant compounds that are present in those skins, such as tannins and resveratrol (1).
White wine also has some of these healthy plant compounds, but generally in much lower amounts (2).
Many different grape varietals are used to produce wine, including Pinot Gris, Syrah and Cabernet Sauvignon.
While red varietals are used to make red wine, white wine can actually be made from red or white grapes. For instance, traditional French champagne is made with the red Pinot Noir grape.
Many countries produce wine. Some of the main wine-growing regions are in France, Italy, Spain, Chile, South Africa, Australia and California in the U.S.
While most regions grow several types of grape varietals, some places are particularly known for one or two, such as Napa Valley Chardonnay, Spanish Tempranillo and South African Chenin Blanc.
Summary: Red wine grapes are fermented with the skin on, which gives the wine its color and provides beneficial plant compounds. Grapes for white wine, on the other hand, have their skins removed.
Nutrition Comparison
Red and white wine have very similar nutrition profiles.
However, looking at the nutrient content per 5-ounce (148-ml) glass, you can see that there are some differences (3, 4):
Overall, red wine has a slight edge over white because it has higher amounts of some vitamins and minerals. Nevertheless, white wine contains fewer calories.
Summary: In terms of nutrients, red and white wine are neck and neck. However, red wine has slightly higher levels of some vitamins and minerals.
Though made in large part of plastic, glass, ceramics, gold and copper, they also contain critical resources. The gallium used for LEDs and the camera flash, the tantalum in capacitors and indium that powers the display were all pulled from the ground — at a price for nature and people.
"Mining raw materials is always problematic, both with regard to human rights and ecology," said Melanie Müller, raw materials expert of the German think tank SWP. "Their production process is pretty toxic."
The gallium and indium in many phones comes from China or South Korea, the tantalum from the Democratic Republic of Congo or Rwanda. All in, such materials comprise less than ten grams of a phone's weight. But these grams finance an international mining industry that causes radioactive earth dumps, poisoned groundwater and Indigenous population displacement.
Environmental Damage: 'Nature Has Been Overexploited'
The problem is that modern technologies don't work without what are known as critical raw materials. Collectively, solar panels, drones, 3D printers and smartphone contain as many as 30 of these different elements sourced from around the globe. A prime example is lithium from Chile, which is essential in the manufacture of batteries for electric vehicles.
"No one, not even within the industry, would deny that mining lithium causes enormous environmental damage," Müller explained, in reference to the artificial lakes companies create when flushing the metal out of underground brine reservoirs. "The process uses vast amounts of water, so you end up with these huge flooded areas where the lithium settles."
This means of extraction results in the destruction and contamination of the natural water system. Unique plants and animals lose access to groundwater and watering holes. There have also been reports of freshwater becoming salinated due to extensive acidic waste water during lithium mining.
But lithium is not the only raw material that causes damage. Securing just one ton of rare earth elements produces 2,000 tons of toxic waste, and has devastated large regions of China, said Günther Hilpert, head of the Asia Research Division of the German think tank SWP.
He says companies there have adopted a process of spraying acid over the mining areas in order to separate the rare earths from other ores, and that mined areas are often abandoned after excavation.
"They are no longer viable for agricultural use," Hilpert said. "Nature has been overexploited."
China is not the only country with low environmental mining standards and poor resource governance. In Madagascar, for example, a thriving illegal gem and metal mining sector has been linked to rainforest depletion and destruction of natural lemur habitats.
States like Madagascar, Rwanda and the DRC score poorly on the Environmental Performance Index that ranks 180 countries for their effort on factors including conservation, air quality, waste management and emissions. Environmentalists are therefore particularly concerned that these countries are mining highly toxic materials like beryllium, tantalum and cobalt.
But it is not only nature that suffers from the extraction of high-demand critical raw materials.
"It is a dirty, toxic, partly radioactive industry," Hilpert said. "China, for example, has never really cared about human rights when it comes to achieving production targets."
Dirty, Toxic, Radioactive: Working in the Mining Sector
One of the most extreme examples is Baotou, a Chinese city in Inner Mongolia, where rare earth mining poisoned surrounding farms and nearby villages, causing thousands of people to leave the area.
In 2012, The Guardian described a toxic lake created in conjunction with rare earth mining as "a murky expanse of water, in which no fish or algae can survive. The shore is coated with a black crust, so thick you can walk on it. Into this huge, 10 sq km tailings pond nearby factories discharge water loaded with chemicals used to process the 17 most sought after minerals in the world."
Local residents reported health issues including aching legs, diabetes, osteoporosis and chest problems, The Guardian wrote.
South Africa has also been held up for turning a blind eye to the health impacts of mining.
"The platinum sector in South Africa has been criticized for performing very poorly on human rights — even within the raw materials sector," Müller said.
In 2012, security forces killed 34 miners who had been protesting poor working conditions and low wages at a mine owned by the British company Lonmin. What became known as the "Marikana massacre" triggered several spontaneous strikes across the country's mining sector.
Müller says miners can still face exposure to acid drainage — a frequent byproduct of platinum mining — that can cause chemical burns and severe lung damage. Though this can be prevented by a careful waste system.
Some progress was made in 2016 when the South African government announced plans to make mining companies pay $800 million (€679 million) for recycling acid mine water. But they didn't all comply. In 2020, activists sued Australian-owned mining company Mintails and the government to cover the cost of environmental cleanup.
Another massive issue around mining is water consumption. Since the extraction of critical raw materials is very water intensive, drought prone countries such as South Africa, have witnessed an increase in conflicts over supply.
For years, industry, government and the South African public debated – without a clear agreement – whether companies should get privileged access to water and how much the population may suffer from shortages.
Mining in Brazil: Replacing Nature, People, Land Rights
Beyond the direct health and environmental impact of mining toxic substances, quarrying critical raw materials destroys livelihoods, as developments in Brazil demonstrate.
"Brazil is the major worldwide niobium producer and reserves in [the state of] Minas Gerais would last more than 200 years [at the current rate of demand]," said Juliana Siqueira-Gay, environmental engineer and Ph.D. student at the University of São Paulo.
While the overall number of niobium mining requests is stagnating, the share of claims for Indigenous land has skyrocketed from 3 to 36 percent within one year. If granted, 23 percent of the Amazon forest and the homeland of 222 Indigenous groups could fall victim to deforestation in the name of mining, a study by Siqueira-Gay finds.
In early 2020, Brazilian President Jair Bolsonaro signed a bill which would allow corporations to develop areas populated by Indigenous communities in the future. The law has not yet entered into force, but "this policy could have long-lasting negative effects on Brazil's socio-biodiversity," said Siqueira-Gay.
One example are the niobium reserves in Seis Lagos, in Brazil's northeast, which could be quarried to build electrolytic capacitors for smartphones.
"They overlap the Balaio Indigenous land and it would cause major impacts in Indigenous communities by clearing forests responsible for providing food, raw materials and regulating the local climate," Siqueira-Gay explained.
She says scientific good practice guidelines offer a blueprint for sustainable mining that adheres to human rights and protects forests. Quarries in South America — and especially Brazil — funded by multilaterial banks like the International Finance Corporation of the World Bank Group have to follow these guidelines, Siqueira-Gay said.
They force companies to develop sustainable water supply, minimize acid exposure and re-vegetate mined surfaces. "First, negative impacts must be avoided, then minimized and at last compensated — not the other way around."
Reposted with permission from DW.