Throwing out bread crumbs of minimal size: Shabbat 143a
Performing [disgraceful] functions with bread: Shabbat 143a
Eating bread with wet hands is like eating impure bread, as it makes the bread disgusting: Sotah 4b
Other Food
Prohibition against passing by food on the ground without picking it up: Eruvin 64b; Bava Metzia 23a
Passing by food, if one is concerned that someone may have cast a spell on it: Eruvin 64b
Forbidding use of an emetic, as Wasteful of food: Shabbat 147b
Weighing levels of Loss in making Terumah Impure rather than Wasting Regular Food: Pesachim 15b, 20b; Menachot 48a-b
Wasting the body is more important than of an item: Shabbat 129a, 140b
In Consuming vegetables instead of bread: Shabbat 140b
In Consuming liquor instead of wine: Shabbat 140b
Clothing
Sitting on a Flax Mat: Shabbat 140b
Tearing clothing, for a purpose: Kiddushin 32a
Money
You can gauge a person's true nature by the way he spends money, the way he handles anger, the way he acts when drunk, and some add by what makes him laugh: Eruvin 65b
