With regards to proteins, meats are great sources always. However, you should try your best to stay away from meats that are high in cholesterol, because it defeats the purpose of your time and efforts. Seafood and white meats from chicken are great options. If you must eat beef at all, which is one of the richest sources of proteins you should pick the leanest parts to avoid gaining unnecessary weight. You should also ensure that you drink a whole lot of drinking water and eat a whole lot of fruits if you are trying to build up muscle mass.They seemed to coexist peacefully. After that, Lee colonized a mouse with one particular species, Bacteroides fragilis, and inoculated the mouse with the same precise species, to discover if indeed they would co-colonize the same web host. To the researchers' surprise, the recently introduced bacteria cannot maintain residence in the mouse's gut, even though the animal was already populated by the identical species. We know that this environment can house a huge selection of species, so why your competition within the same species? Lee says.