Talk about touching a nerve.
Sorry to disappoint but it's possible to have opinions about WLI's without being either of your two options.
I know several people who've used them...by a quick count, 8 (two family members, one school mum and 5 work colleagues/friends). Well, I probably know more but these are those that are open about them.
From what I see, two have changed their lives...as in, eating healthy foods, taken up significant exercise, seem to be staying on a low dose so they've lost slowly. Talking about the gym after work, always checking their steps on their smartwatch and dragging people for rainy lunch time walks...you can truly see the changes.
The others have dropped huge amounts of weight in months, talk about their hair falling out, don't seem to be exercising at all and simply seem to be barely eating with no other changes. Two of them look fucking dreadful, like grey deflated balloons.
My opinion on WLI's is that they're a fantastic tool as part of a huge lifestyle overhaul. But that unfortunately, many of those on them aren't overhauling their lifestyle at all...they're just injecting and dropping 8 stone in 10 months because they're not eating enough to sustain a five year old.
Do I think 'most' people will sustain the dramatic losses long term? No.
Do I think that many will start suffering with all kinds of health impacts due to the dramatic losses over far too short a time with no other changes? Unfortunately yes.