If you've been writing any amount of time, you know that conflict is what makes a reader turn the page. Conflict drives the plot. I've heard a million times, that when you don't know what else to do-say you hit a boring part of your story or you find your middle sagging and dull and lifeless-then torture your characters. Conflict pulls them together. (It's us against the world, baby.) Conflict tears them apart. (I can't believe you betrayed me like that.)
You have internal conflict. (I swear I won't eat another one of those luscious dark chocolate brownies...with nuts... and icing...sitting right there...) And you have external conflict. (The landlord is going to evict you if you don't pay the rent on time.)
Each scene in your book should have some form of conflict, but the conflict must move the story forward. Having your character hiding chocolates in their closet can be conflict if it moves the plot. For instance-mother can't find out about my addiction to chocolate. She already thinks me weak and will disown me. Without her money I won't have anywhere safe to stay while I search for the emperor's lost tomb. The tomb must be discovered in the next 48 hours or the world will end...
So, yes, torture your characters, deny their desires but remember: do it with purpose. Torture for torture's sake is useless and will turn the reader off.
For example: arguing with a neighbor can be conflict but if you do it simply to show that the characters neighbors are nuts-cut it. It does not move the story along. If, however, the neighbors stand in the way of your characters ultimate goal, then keep the scene it moves the story along.
Finding the right quality and quantity of conflict in a story is like walking a high wire. Too much and the reader will put it down as misleading and ridiculous. Too little and the reader will be bored. Putting together the right amount of conflict takes practice but with time and a judicious eye, you can learn to create a combination of conflicts that grabs the reader and keeps them asking for more.