The Hill: US has new alcohol guidelines: How much is healthy to drink? BuzzBallz, a brand of pre-mixed cocktail in colorful orbs, are all the rage. Experts worry they are a magnet for underage drinkers.

Understanding the Context

(NEXSTAR) – The new U.S. dietary guidelines, unveiled to the public on Wednesday, include an upside-down food pyramid, lots of protein and a new take on alcohol consumption. The updated 2025-2030 ... There's good news for fitness enthusiasts who enjoy a drink every now and then: recent studies have examined the effects of exercise on the risk of death, cancer, and liver disease and have found ...

Key Insights

The flow rate increases 100-fold (one hundred-fold) Would be a more idiomatic way of saying this, however, the questioner asks specifically about the original phrasing. The above Ngram search would suggest that a one hundred has always been less frequently used in written language and as such should probably be avoided. Your other suggestion of by one hundred times is definitely better than a ... Yes, the correct usage is that 100% increase is the same as a two-fold increase. The reason is that when using percentages we are referring to the difference between the final amount and the initial amount as a fraction (or percent) of the original amount.

Final Thoughts

Why is "a 100% increase" the same amount as "a two-fold increase"? If soap A kills 100% and soap B kills 99.99% of bacteria, the remaining amount of bacteria after applying A (0%) is infinitely smaller than the remaining amount of bacteria after applying B (0.01%). Therefore A is much, much better. You can see from these examples that 0.01% gap behaves differently across the percentage scale.