There is nothing new under the sun when it comes to work environments. You are not simply entitled to your break, it is mandated by law. It is for YOUR protection, your health, your well-being. You are giving away your time when you do not take your break, working unpaid overtime.
As a group you need to develop a safe way to take your lunch breaks; include management in your discussions if need be. There needs to be adequate relief, and management is OBLIGATED to provide that relief.
As an aside, many, many years ago, when lots of nurses smoked, the smokers all managed to take all of their breaks, and then some. As a non-smoker, I finally got annoyed watching everyone else's call lights, etc. So one day, I found a newspaper, and went on a break to the nurses' lounge. The supervisor was told I was in the lounge, and she came to ask me what I was doing. I told her I was smoking. The 'extra' breaks suddenly disappeared.
I have worked enough different ICU's and acute dialysis, I know there are times when it seems nearly impossible to get away. But there are no awards for the fewest breaks taken, or the most lunches missed. Again, management is required to give you those breaks and lunches. And OSHA regs usually forbid eating near patient care areas.