based on my experiences:

Bad weight-loss advice #1: Eat five meals a day
true. i can never eat 5 meals a day. i'm fine with the 3. i don't have the time to be spacing meals out.

Bad weight-loss advice #2: Don’t eat after 7 p.m.
also true. you won't gain weight but if you're keeping really close track, you might retain water the next day but not over time.

Bad weight-loss advice #3: Don't eat carbs
also true. i can't go without carbs. i never understood how people could. when i did atkins before, the fourth day on the diet, while i was working out, i passed out. it's from not getting the energy that you need to work out. carbs are like fuel. you need a certain amount of them a day.
it's just much easier and you can count on sticking to calorie intake.

Bad weight-loss advice #4: Don't eat fat
another true one. healthy fats, such as fish, nuts and seeds, olive oil and avocado are great. only very few people can go on a no fat diet all their life. you need it. fat is fuel too.

Bad weight-loss advice #5: Trust food packaging
true true. there's so much other ingredients and junk and oils put into that stuff. it's so much better to eat natural stuff like fruits and veggies and you get better benefits too.

Bad weight-loss advice #6: Eat lots of soup
i beg to differ on this, but not so much. it all depends on the the sodium intake. if you're choosing ones low in calories and sodium then it'll promote weight loss. most soups are so high in sodium, it's ridiculous. you'll retain so much water, you'll think you ate a whole buffet when you step on the scale.

there are so many myths out there.