A gyre is another name for a swirling vortex. Ocean gyres are large swirling bodies of water that are often on the scale of a whole ocean basin or 1000 s of kilometers across (hundreds to thousands of miles across).
Lean meats are meats with a relatively low fat content. Skinless chicken and turkey and red meat, such as pork chops, with the fat trimmed off are examples of lean meat.
Poultry cuts are among the leanest meats you will find at most grocery stores. Broil, bake or grill these cuts, and eat them with green salads or a medley of non-starchy vegetables, such as broccoli, cauliflower and asparagus, to create a low-carb meal.