Do you have good method to lighten the weight?

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Now I am in a special period,the summer is coming,the clothes we wear less and less,but the problem is coming to me too.After a winter,I accumulated too much fat,so I need lighten my weight as soon as possible.I do many different sports everyday,and eat more less than before,but it seems to have no effect on me.I nearly be crazy,I don't know how to lighten the weight,do you have good ideas?Would you please give me some suggestions?I will be much grateful. Thank you very much!