Consider it a snack. Eat less. Cookies are not good things. Biscuits have only two purposes, hunger and hunger, and nothing else, such as the so-called Hericium erinaceus, high calcium, weight loss and commercial gimmicks. If it really has this function, it can't be regarded as food and non-staple food, but should be classified as health care products and medicines, that is to say, it can't be sold casually.
In fact, the ingredients of food sold in the market are not very reliable, and it is also well-founded to say that it is junk food. Everything produced by large commercial factories for profit is always suspicious.
When, what to eat and what to do afterwards have nothing to do with whether you will be fat or thin. Whether you will be fat or thin has a lot to do with your physical fitness and heredity. Gaining weight is as difficult as losing weight. It varies from person to person. You don't know until you try it yourself. Of course, a reasonable diet can make you healthier.