where can i promote my weight loss free ebook ?

hi, i made a weight loss ebook, promoting an affiliate product within it, how/where can i promote this ebook to get leads ?
i put it's download link with some promotional text in a weight loss forum but i didn't get any download even if there are some viewers

Facebook is the best place. There is a company now that is selling niche specific facebook accounts where either most of the friends on the account has a specific interest (like weightloss) or they are members of a lot of groups that are related to the niche. I have not tried weight loss but I got an account that had about 1400 friends that were all gamblers and promoted a casino offer and did very well with it. The accounts are around $200 but it was well worth it.