Although fitness and nutrition are not the same thing they are in the same area - health. If you want to improve your overall health level you should consider exercise as well. This will actually help you to stay motivated about your eating habits as your body will start to crave healthier foods.
Try to increase your levels of protein and decrease the amount of carbohydrates you intake. Protein can be really beneficial to increasing muscle mass, something which will also help you to lose weight. Don't avoid carbohydrates completely but eat them in moderation and be sure to eat more complex ones like fruit and grains.
HDL stands for High Density Lipoprotein, which you should eat more of than LDL, Low Density Lipoproteins. The low density forms of cholesterol, LDL, can get clogged up in the arteries of the body. Blocked arteries may present major health problems for people who ingest a lot of red meat or other fatty foods. Because of this, it's important to monitor the different amounts of HDL and LDL going into your system.
Don't feel like you have to completely eliminate fats to have a healthy diet. Cutting back on healthy fats is actually unhealthy, and can have a negative effect on your muscles, bones, joints, and major organs. Keep your fats healthy for optimum benefits. Unsaturated and polyunsaturated fats are the way to go.