The term U.S. Real Property interest means an interest in real property (including an interest in a mine, well, or other natural deposit) located in the United States or the U.S. Virgin Islands, as well as certain personal property that is associated with the use of real property (such as farming machinery).
Ketosis is an eating plan where the body uses ketones to fuel the brain and body instead of glucose like most people use when on the SAD (standard American diet). It can be very helpful for blood sugar and consistent energy because fat is a very stable source of fuel.
Yes, eating too much protein can knock a person out of ketosis. I base this on my experience of eating a low-carb, high-fat diet for several years (as I blog about at lifeaftercarbs.com). I have found that to get into and stay in ketosis, I need to get 70% or more of my calories from fat. Typically, then, I get about 10% from carbs and 20% from protein. Lowering my percentage of calories from fat by either eating more carbohydrate or more protein (or a combination) can knock me out of ketosis. Now, I'm not as sure about the per one meal part of the question. I usually think in terms of a day.