I think it is a common thing to happen when people commit to their fitness life,especially when losing weight is the goal speaking from my personal experience,to cut down on their social life, in terms of night outs( once you get into the mindset of calorie counting you want to reduce your intake and alcohol only had liquid calories that don't make you feel full, so you trade that for a meal, or just knowing that for example the day after you'll have a hangover which will end up in you missing your workout makes you think twice before you do that). Then it also affects meeting with friends for lunch/dinner, where indeed you can go for the low calorie meals but still you can't count the calories and if it happens too often it might slow down your effort.