DD is now 14, so that may put a context on my experience.
The advice then, as now, was a blanket - no alcohol. As it was a blanket no to many types of (medical) drugs, and lots of other stuff (soft cheese anyone?!).
My GP however was quite pragmatic. She explained the rationale for many drugs being a no-no - because drug companies are afraid to test them on pg women, even if safe and effective in normal populations, just in case there is a repeat of some of the more historical cases (I know an anti-nausea medication which had been deemed safe and commonly given resulted in a number of birth defects, for example). So certain antibiotics I had taken for chest infections in the past weren't an option when I had another chest infection (I have shitty lungs!!) and I had to seriously increase my inhalers and take time off work that I normally didn't need to get rid of it by rest rather than meds.
On foods, caffeine, wine etc:
OK alcohol first - GP felt that you wouldn't want to be knocking back a bottle of wine a day. But that at the same time, a small amount was not statistically harmful (we did talk about FAS etc) so a small glass of wine per week would be ok and that a more relaxed mother was better for a growing baby than a stressed out mother.
Or a small beer.
But no spirits.
And there were no issues with cooking with alcohol as that was burned off in the cooking process just leaving the taste.
Caffeine - again, too much was not good, not from a long term impact, but baby wouldn't grow as well in utero. And would also drive me daft once they were big enough to kick, with hyperactive kicking. But a cup of coffee a day was no problem at all, and the odd day having a second was fine. And especially as my coffee of choice is a latte, the extra milk was good for calcium for my and baby's bones. These were the days before decaf was commonly available in coffee shops.
Food was the big one!
Blanket ban on shellfish included both those stuck to rocks all the time or sitting in sand and eating by filtering the water around them (mussels, clams, etc) and also prawns, crab, lobsters etc which got their food by catching smaller fish etc in the water to eat. The main reason for the ban was the number of cases of problems where food poisoning had been caused by filter feeding shellfish sitting in polluted waters and still being served - food poisoning being unpleasant for everyone but worse for PG ladies.
But that those shellfish that moved around rather than sitting in 1 place, and eating a variety of food rather than just filtering out particles, once properly stored and cooked, would be fine to still have. (Just try getting a waiter to accept your order for prawn cocktail though....). At the time, I didn't eat crab or lobster, but loved a good prawn.
Salads and creamy dressings - mostly to do with the threat of listeria leading to food poisoning. So if it was a salad (coleslaw, potato salad etc) that I made at home safely, or that came in a sealed packet from the factory in a fridge rather than an open tub in the deli counter in a shop, they were fine to eat. But I didn't get anything from deli counters for those few months.
Cheese - no unpasteurised cheese, or soft cheese or blue cheese. Again, food poisoning threat.
So we agreed that pasteurised hard cheese were fine and unpasteurised hard cheese that was mature was also ok.
Soft cheese that was pasteurised was also ok (and again, the "properly stored and packed and coming from a factory with good hygiene standards" thing applied here as with salads - so a slice of brie from a deli counter was a no, but a slice of brie that had been cut and packed in the French cheesemakers' site and was pasteurised was fine).
Blue cheese we unfortunately concluded was off the menu temporarily.
Meat needed to be thoroughly cooked - in general. Again, a food poisoning thing.
Chicken and pork always would be anyway.
But red meat - well any mince always cooked to no pink and especially when PG.
For lamb chops or steak or a roast - well I like them quite rare anyway. GP reckoned that if they were a single piece of meat, had been well stored and cooked, and it wasn't loads of it, an occasional pink bit was ok. Not red and bloody, but I didn't need to get to well done and leathery.
Things like tiramisu were also off for multiple reasons - strong alcohol, soft cheese, (and usually a full stomach by the time dessert came!! No one told me beforehand how much room a baby takes inside and the impact on being able to eat a proper meal!!).
But lots of other things, in moderation and if reasonable precautions around the reason they were not recommended (or banned, depending on who said it!), were still ok.