While using "Fat Burner for sale" may trick some search engines, many customers would be upset if they felt they had been tricked into viewing the website thinking there are items at a "Sale Price" on the website.

If you are offering the Fat Burners at a Sale price it will help if you use "Fat Burner Sale". I believe the search engines like Google can understand the context of how you use the word "sale" but others may not. Regardless, the buy decision is still left to the customer and if he/she feels tricked into viewing the site, you may just be getting traffic and no conversions.

Just take a walk in the mall now that Christmas is over. You will see many retailers that have the SALE sign out. When you walk into their store to find that there really is not a true SALE happening, how do you feel? What is your impression of the store? Is that how you want your website vistors to feel.

I agree with the previous response "everyone likes a sale". Just make sure it is a true sale price if you use the keyword "sale". The "sale" price does not need to be the best on the Web but it should be at a significantly lower margin as conpared to the margin you use for the other similar items in your store.