When most people talk to me about eating healthier, they don't really know where to start. I usually tell them to start with eliminating all the trans fats or hydrogenated oils from their diet. There is no healthy amount of trans fats that should be consumed and more important, because trans fats are a man made product our body's have no way to digested them.
When you are shopping you may see on a package "No Trans Fats" but make sure you check the ingredient label to make sure that there are no hydrogenated oils in the product. Let's use trans fat or hydrogenated oils as an example, if there is less than .50 grams in a serving size, the manufacturer can label that product "trans fat free" when in reality there are trans fats in the product. Quite a few manufacturer simply decreased the amount in a serving size so that there was less than .49 grams of trans fat per serving and thus created a product that could be labeled as "Transfat Free".
Now, I know that .49 grams doesn't sound like a lot, but add that up throughout your day and your could end up with quite a bit of trans fat in your diet without even knowing it. Hope that this helps with your next trip to the grocery store.