This article is yet another example of the hysterical and guilt-ridden attitude that pregnant women so frequently encounter.
Regarding peanuts, current medical thought is actually that eating peanuts during pregnancy will do no harm at all.
Regarding sushi, the reason for avoiding raw fish is that it can sometimes contain parasites, which may cause problems. However these parasites are destroyed by freezing. All fish served raw in the UK must by law have been pre-frozen - if in doubt while at your favorite sushi restaurant, ask.
Use your common sense when it comes to the food you eat. For example, I wouldn't touch a steak from Angus Steak House or similar establishment under any circumstances. But while pregnant I have happily eaten immensely blue steak from my local butcher, and very good steak restaurants.
Common sense again might suggest that radically changing your diet (assuming it is relatively healthy in the first place and does not consist solely of takeaways and vodka) would not be a good idea as your body is experiencing plenty of radical physical change just by being pregnant.
And as my fortunately very relaxed midwife said to me, if your body wants it, it's probably fine; if your body doesn't, don't eat it.
Go with your instinct and don't let the paranoia and panic surrounding pregnancy get you down.