I don't have advice but my personal experience is that lifting weights is easy but cardio is almost impossible. I don't really fast on purpose but I mostly eat

I don't have advice but my personal experience is that lifting weights is easy but cardio is almost impossible. I don't really fast on purpose but I mostly eat one large meal a day (dinner). I workout in evenings before dinner. I do snack if I get hungry maybe around 4PM. My snacks are usually Lay's chips. Sometimes, I get a Gatorade for gym. I can lift about as heavy as if I had a big lunch but cardio is different story. If push myself as hard as one days when I had lunch or a lot snacks, I will start to see stars. I go a lot slower with cardio then. (Seeing stars or vision going white is sign of sudden drop in blood sugar level).