In the morning, can you do weights and then cardio on an empty stomach? Aaron Marino of alpha m. emphasizes that doing a workout and cardio on an empty stomach is the best way possible to reduce body fat.
Your body is burning the calories most readily available. If you have an empty stomach, your body will go directly to fatty acids (65 – 80% of heart rate reserve). You won’t be quite as strong as if you ate a few hours prior. But if your goal is body fat loss and you can do it, do it!