I know some have touched on this, BUT I'd like to add my 2 cents here because it's soooo important for anyone reading to understand (& assume we are NOT the exception):
The only way to lose weight is to consume fewer calories than you expend.
GLPs like reta are so great for weight loss because they reduce the amount of calories we want/eat naturally. Everyone's dietary needs are going to look different though due to goals, starting point, etc... so I recommend googling a
TDEE calculator to get a baseline for your current intake vs your goal weight's intake.
From there, develop a moderate deficit (or surplus, pending goals) from your current caloric intake and watch the weight melt off - usually you'll see ~0.5-2lbs drop weekly if you're tracking calories correctly (yes, a food scale IS worth it - no, deficits >500 are NOT worth it).
Bonus points if you incorporate strength training and macro tracking (especially protein) to avoid any "skinny-fat" business
I'm petite (5ft) and went from 135lbs to 105lbs on Tirz in the course of 1yr - my weight loss only really kicked in on month 3 when I started tracking calories.