Not all of these are healthy substitutes in my opinion, but some are, so use your own judgement. 20 Unique Healthy Food Alternatives --I'm interested to read about some of these things, and I know some of the substitutions only work in some circumstances.
Art Cake Cooling Tip: When cooling cake layers, place bread slices on top to keep the cake layers soft and moist while the bread becomes hard as a rock -- What a fun fact! My mom told me it keeps it from cracking in the middle too! baking-baking-tips
From Muffin Tin Mom: Keep Sliced Apples Fresh With Ginger Ale. Soak them in Ginger ale for 10 minutes (or any lemon-lime soda) and they won't turn brown. Great way to pack apples slices for lunch. (Apples still taste like apples)