Best to suffer in silence.

Whatever floats your effluvia @bigpawbullets. I think that your post is well suited to "Food Glorious Food". Returning to the soup - why cabbage, from memory celery has far less calories than cabbage and eaten raw is bulkier.
However you, and she in need of fitting into swim suit, do realise that the temperature in New Zealand in October is mainly less than 15°C? Further north in Australia I decline swimming in anything less than 30°C.

Nope!

This post definitely belongs here

I did that diet quite a few years ago. Tried it again about 7 years ago. Last time I said never again.

If I've overindulged then put on a few pounds, simply cutting down on or out carbs does the trick. And very quickly too! 3 oz of meat twice a day - chicken, turkey, lean beef, sea bass, or cod. ( I use nuts and seeds.) green beans broccoli cauliflower lettuce cucumbers Tomatoes radishes, asparagus or onions. Two cups of vegetables twice a day. Two whole pieces of fruit, apples oranges or a plum or one cup of berries, strawberries blueberries raspberries twice a day. Green tea to drink, only stevia as a sweetener. And pink Himalayan salt a half a teaspoon a day. Drink half your weight in ounces of water everyday. Spread it out so you're not hungry. Works like a charm!

Are we in time to mount a rescue operation?

Our whole family was on that diet for about a month when I was a kid, not sure if it was for our health or just that we were temporarily broke and couldn't afford anything but cabbage. Survived it but wouldn't choose to do it again.

Was watching Midsomer Murders , and an episode was built around the, cabbage soup diet .

I'm concerned about the hole in the ozone layer? It's going to grow!

Sorry, I've never tried it.