diet for a chubby girl

so I've been thinking about doing this smoothie only diet for a month as a trial to see if it's a permanent thing I could commit myself too. I've been told a smoothie only diet can seriously help with moods, health and weight. my biggest problem is my weight right now. being 5'5 and 238 pounds, I'd love to loose weight. I'd love some feedback about what you think of the got. if you have tried it out some pros and cons you'd think I'd walk into. thanks!

by the way pics are me now. hopefully have even better after pics!