So what’s the truth?
The truth is that even the most mineral-rich unfiltered water isn’t a significant source of beneficial salts or minerals. We get our recommended mineral intake from the foods we eat, not the water we drink.
So, while drinking reverse osmosis water will slightly lower your mineral intake in comparison to drinking mineral water, there is no significant difference or health effect.
Getting enough minerals from your diet, whether you’re drinking regular water or reverse osmosis water, is as simple as eating a balanced diet.
There is also no recognized recommendation against drinking slightly acidic water. Normal water has a pH of around 7, whereas RO water has a pH of around 6.5. So, the difference in acidity is much smaller than sources against RO water tend to admit.
It’s worth pointing out that considerably more acidic foods and drinks such as lemons, soda, tea, and coffee are all widely consumed without concern.
Some reverse osmosis systems even contain a remineralization stage to reintroduce beneficial minerals into the water supply after filtering.
Once the water has passed through the RO membrane, these systems reintroduce calcium and magnesium salts, so that you can access RO-filtered mineral water.