I'm really not thin, but a male colleague said, I'm still eating when I'm so fat, otherwise I'll say, if you don't lose weight, how can this person have a mental state?

I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart. You can adjust your mentality and take what he said as an encouragement or a warning. I can see that he is a casual person and outspoken. When he thinks about what to say, he should not aim at you intentionally, or want to strike up a conversation with you and find a topic. Such people tend to be thinner. He should not only say this to you, but also to other colleagues or friends, so don't take the other person's words too seriously. The speaker has no intention, but the listener has a heart.