Why is that when I was fat people are telling me to lose weight and when I lost weight they want me to gain weight?

When I was fat my aunt would tell me to lose weight and then I lost weight 160 cm. 54 kgs and then she said I look better when Im chubby because I look old and sick now.
Why is that when I was fat people are telling me to lose weight and when I lost weight they want me to gain weight?
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