How do people gain weight back?

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Im confused why so many people once they get to goal weight, somehow gain the weight back?
I am close to goal weight now so I'll occasionally slip gain a couple pounds but start again.
Im just confused at people who drop several sizes, just let themselves gain it back "without noticing".

For me if I were to go back to old habbits, once Id notice I am up say 10 pounds (really 5 but that could just be a chinese buffet meal the day after) I'd make a plan to get back on track ASAP.. but i see threads about people who lose 50 plus lbs but return with all that weight and then some back.
Im terrified to have that happen to me so I'd love insight into why we think those types of people struggle or let it happen. Thanks
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