[badpenny]

This is clearly unsubstantiated - the benefits of coffee are very clearly outlined.

No they aren't.

http://aje.oxfordjournals.org/content/156/9/842.short

http://www.ncbi.nlm.nih.gov/pubmed/20182035

These are just two of the first studies I found. There are plenty of others.

if you do not over-do it, there is a 90% chance of feeling more alert when you drink coffee.

90% of statistics are made up on the spot. If you're going to acuse me of making shit up on the spot maybe you shouldn't do it yourself? Feeling is the operative word in your statement.