What is good for weight loss... i'm currently taking slim fast shakes and eating no meat for 3 weeks now.. is this safe to do?

Sugar is enemy: Sugar is the enemy. Not meat. To lose weight you need to make your low calorie diet high in proteins and low in sugars or carbohydrates.

It is safe: But what you really need is a well-designed program of diet restriction, education, exercise and weight reduction that you can follow for the rest of your life. Check w/your physician and a good registered dietitian rather than relying on commercial products. Real food is cheaper and healthier.