Hume-cause and effect

"our reason, unassisted by experience, can never draw any inference concerning real existence and matter of fact"

Hume thinks that it is not possible to know cause and effect a priori. To prove this, he uses the example of bread and how it nourishes our bodies. There is no connection between bread and the nourishment it provides for us. From looking at the bread, you cannot tell that if you eat it it will nourish your body, unless you already knew of it nourishing your body. I agree with Hume because if you think about it, you wouldn't know anything unless you gained that knowledge from experience.