What do you think “natural” means?

I specifically said *human* intervention, so your first example does not apply.

Bread and cheese are foods made (and invented) by humans from natural ingredients.

Neither bread nor cheese are natural ingredients. ( One could postulate in respect of cheese, but most cheeses found in sandwiches are resultant of a manufacturing process).

And why do you only single out humans as interventionists?

I said they (generally speaking) are *made from* natural ingredients— wheat, milk, etc.

I specify human intervention because I have found that is the intent of the meaning behind the adjective “natural”— that is its descriptive property. If, as you seem to say, everything in the universe is natural, then the word “natural” never really had any need or purpose for entering language in the first place. You render it meaningless and lacking any descriptive property. You may as well just say “it’s a real thing” instead of “it’s natural.”

"Generally speaking".

Everything is made from natural ingredients.

Can you name an unnatural ingredient?

Regarding edible substances in this case, yes— high fructose corn syrup.