Yes, as long as you eat them in moderation. Here is some professional information.
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1 cup of avocado has 21 grams of fat and 234 calories - you'll have to decide if you want to eat that or eat more of something that has fewer calories and less fat. Diet is a personal choice where you pick the things you want to eat - but if you're trying to lose weight, you'll want to choose lower fat items with more fiber and fewer calories (in my opinion)
You can, yes, but Avocados are high-calorie foods, so they would have to be budgeted carefully in your calorie budget.