How could I get my boyfriend to stop complaining about my body?

I love my boyfriend (of 4 years) but recently he’s been really annoying about my weight. He is constantly pestering me about it. I can’t relax for a second without him saying I should exercise more, I can’t eat anything without him saying I should eat less. And look, I am not a stick but I’m definitely not fat, and eating an extra burger isn’t going to change that. So how can I get him to stop?
How could I get my boyfriend to stop complaining about my body?
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