Around 70% of polyphenols in beer come from barley, while the remaining 30% comes from hops ( 9, 11). It's thought that flavonoids, a plant-based antioxidant found in darker drinks such as stout beers and red wine, are responsible for this. Where else will you find flavonoids? It is expressed as a volume percent and represents the milliliters (ml) of pure alcohol in 100 ml of the beverage.

Guinness Draught: The Iconic Irish Stout | Guinness® GB Guinness Draught: The Iconic Irish Stout | Guinness® GB

The healthiest way to get the iron you need is by eating plenty of leafy green vegetables, beans and nuts. You'll also find iron in red meat, but this, like alcohol, should be enjoyed in moderation.

Is Guinness good for your blood?

However, a lower hop rate doesn’t mean a lower alcohol content. In fact, with an ABV of 8%, this beer has the highest ABV of the varieties on this list.

Guinness Original Stout 24x 330ml - DrinkSupermarket

The U.S. Dietary Guidelines urge consumers to limit their alcohol intake to two drinks per day for men and one for women ( 6).

Now for the disclaimer

The brand’s famous 1920s slogan “Guinness is good for you” has little to do with an actual health claim. The yeast in Guinness (and indeed any beer) contains vitamin B12, which performs many vital functions including creating red blood cells, which carry oxygen around your body and remove carbon dioxide. One tablespoon of yeast will provide an adult with their full day's supply of vitamin B12. Where else will you find these nutrients? In this case, the 11.2 grams of alcohol in 12 ounces (355 ml) of Guinness contribute 78 calories, which accounts for roughly 62% of its total calorie content.

Guinness Loading Page - Guinness

Similar to Guinness in bottles, Guinness in cans was developed with a spherical widget inside that releases pressurized nitrogen during the drinking process to mimic a nitro draft pour. When the can is opened, pressure within the aluminum drops to match the pressure in the room. As the pressure within the widget itself, which is filled with pressurized nitrogen, is still higher than the beer around it, tiny bursts of nitrogen are released into the liquid. This then provides the brew with Guinness’s classic creamy head. The secret to its particular taste is the use of extra hops and a stronger ABV, which were initially meant to preserve the beer during long overseas excursions.One of the more unusual facts about Guinness is that it used to be given to people after they'd given blood, due to the belief it would help replenish their iron stores. Incredibly, this was happening as recently as 2010! This means it has a drink equivalent of 0.8 for every 12 ounces (355 ml) of beer and thus provides 78 calories solely from alcohol. 2. Guinness Over the Moon Milk Stout