If a friend invites you to dinner when you lose weight, I think you still have to go, because we know that losing weight is not a day or two. It's a long process, and your friends have warmly invited you, so go ahead. You can have a good meal when you go, but you should learn to improve after eating, and learn to strengthen exercise after eating. Or eat less in the usual diet, so that the diet can be reasonably solved. Otherwise, if you eat too much and exercise too little, it means that you will consume them all in the future.