How do you know which sentences use "il pane" or just "pane"?? Ive noticed that certain sentences say THE bread and it translates to just bread, and others dont have the word "the" or "il" when referring to just bread. The same goes for sugar or zucchero. How do you know which sentences would have lo zucchero or just plain zucchero? Since both of them sometimes just mean sugar?
In English "He eats bread" and "He eats the bread" mean very different things!
If the definite article "the" is used then it is referring to a specific piece (loaf, slice, or whatever) or pieces of bread. Without the "the" it just means that he will eat bread as part of his diet.