She disagreed on my decision

As soon as I told my sister about my taking some diet pills, she opposed my action right away because according to her, it has bad side effects. I was thinking to myself, how will I know if I do not try it myself. I know my sister is just concerned about the side effects and so am I. But I’ve already decided that I will give it a try and see how it works for me. I will try one bottle and if it works, so be it. I’m doing some exercise though and drinking plenty of water. I’m also taking multi-vitamins. I’m so determined to lose weight. I’m serious!