Had to Turn on Comment Moderation

Recently I have been getting "comments" on my blog that weren’t actually comments. They were really just links to "herbal weight loss products." I have been removing/editing them, but it is starting to upset me.If you know my story, you know that I've lost all of my weight naturally. No gimmicks, No pills, no surgery... I just count my calories and try to be active! I've NEVER used any of that