That is not true. You can lose 3 lbs in a day. In boxing the're not actually loosing weight, as much as they are cutting weight. For several days before the weigh-in, fighters stop taking in sodium, accordingly, they do not retain water weight. Thus, they can "safely" drop between 10 and 15 pounds for the weigh in. Although, like I said, it is not actual weight, only water weight. So when they drink water or resume salt intake, they will quickly reabsorb the weight back.
That is why you see fighters gaining upwards of 20lbs after the weighin
You can even test it yourself.
Look at the sodium intake of everything you eat, and dont eat any salt for a day. You will momentarily lose 5lbs.
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