When it comes to measurements, the everyday kind that deal with things like air pressure, tire pressure, blood pressure, etc., there is no such thing as an absolute accuracy. And yet, as with most things, scientists are able to come up with a relatively accurate way of gauging these things by measuring them relative to other things.
Quick Answer. Eating coffee grounds is not bad for an individual's health, according to Sandeep Godiyal for Natural News. In fact, coffee grounds are very high in antioxidants and nutrients, even when they are used to make coffee.
Coffee grounds are a good addition to the compost pile. I am not overly concerned about using them as a mulch, but it might harm some plants â nobody knows. It is doubtful that they have a great effect on pests, but unless the grounds are very acidic, they will NOT acidify your soil. References: