The only advice I can really give you for certain is to never ever go grocery shopping when you are hungry. If you do, you will probably gain a lot of weight from all of the junk food that you will buy.

I found a list online of gross stuff you shouldn't buy at the grocery store, according to people who WORK there.  And obviously it depends on how good the store is, but here are the top four . . .

1.  Pre-packaged cold cuts from the deli.  Meaning stuff they sliced up in the store that morning, because they probably used older meat that was about to expire.  But even if it was fresh it won't last as long, because the clock starts ticking as soon as they slice it.  You get about 3 to 4 days to eat it before it starts to go bad.

2.  Bags of pre-shredded cheese.  It has additives like wood pulp to keep it from melting.  So you're better off buying a block of cheese and shredding it yourself.

3.  Pre-made salads at the deli or in the produce section.  Sometimes they use old vegetables that are about to expire.  Then they add things like olives or hard-boiled eggs so you don't notice that everything else doesn't taste very fresh.

4.  Soup at the deli.  Again, a lot of stores save money by using ingredients that are about to go bad.

Plus, there's no way to tell if it's been sitting out all day.  And if it's self-serve, it might be contaminated with bacteria and germs, because dozens of people have probably opened the lid to smell it. (Thrillist)

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