All companies I have ever worked at have been very lenient about letting workers get up and move around and take walks or breaks if needed - but I had a friend who worked for a company that monitored bathroom breaks - that's ridiculous. Any boss who is worth a damn would be fine - it's the same reason why most classes in school are 50 minutes long, the human brain can only focus on one thing for so long without breaks before it starts to become less productive.
About coffee, no issues with coffee/caffeine right now - but I think it is an issue with caffeine coming out as an addictive drug and the office environment promoting coffee drinkers. Many companies offer free coffee as a "perk" - I know I enjoy it, but once it starts to become a major health issue (i.e. healthcare companies start paying out the nose for treatment) it will become a major issue. Same thing with obesity, many companies now have wellness plans that if you join will give you a break out your healthcare costs, even though it isn't possible for some people to take part (disabilities or physically unable) - but obesity is a protected class, you were born obese - granted you can claim you were genetically pre-disposed (that's my claim). Its all about big healthcare, companies are trying to reduce their healthcare costs because they are rampant right now, even with Obama's plan (which I will save my criticism for the politics board) are continuing to rise - anything a company can do to lower the rates they will. If that means not allowing smokers (me), or getting fatty outta the desk - they will do it.