Can I lose weight like this? (details)?

I am taking energy/calorie burning/stress reliever pills (4 per day, which is less than the recommended dosage) and I'm drinking a slim fast (or carnation instant breakfast) for breakfast. But then I eat a normal dinner at night. Lunch is usually an energy bar and either water or diet soda. I've only been doing this for a few days, so I was wondering if this routine will get me some weight loss or if I'm wasting my time.