I didn't even know it was happening.
One day this massive box appeared at our front door and instantly the life of our family changed forever.
Or for at least the next two months, I don't really know how these things work.
All I know is we could have bought a LOT of groceries with the money we spent and it feels as though we'll be investing in this for the foreseeable future.
Emblazoned across the side of this cardboard monstrosity was the word "Isagenix".
I foolishly hoped that this was a new form of Lego designed for men old enough to know better but I would soon be disappointed.
No, Isagenix is part of the relatively new craze that is meal replacement shakes.
I say "relatively new" but in reality replacing meals with fluids is not a recent phenomenon: "A steak in every beer", "Eating's cheating".
What were once the calling cards of those bordering on alcoholism have now given way to derivatives that celebrate the fact that food is very rarely consumed.
I have my own supplements drink that I take each morning that is supposed to enhance mood and suppress hunger but it demands that you eat something within two hours of taking it, not to put a lock on the fridge.
Like when Google floated in 2004 my only regret is that I didn't buy shares in the meal replacement movement when it exploded into the mainstream a few years back.
Donna's program – and I imagine that of the other Isagenix disciples that includes her sister and my best mate – consists of shakes twice a day and one meal, which more often than not tends to be lunch.
Which has left me with the nightly task of preparing the evening meal for myself and our two children aged 9 and 5.
So I quit my job. Okay, there's more to it than that, but Donna's dietary adjustment has had a significant impact on the rest of the family.
Last night I served up what I thought was a nutritious meal of grilled chicken strips with sweet potato, potato and broccoli; the 9yo declared he was just going to have a V8 juice instead "like Mummy".
Like most of us, I have my own weight self-image issues to overcome, issues that would be infinitely easier if I didn't enjoy the act of eating so much.
I don't claim to have a refined palette or expensive tastes but I can't imagine a life where food doesn't even figure in the "best supporting life experience" category.
Very good friends of mine happily exits in a relationship where one is vegetarian and the other isn't.
I always thought they were missing one of the great aspects of a relationship by only being able to share meals where meat was never present in the kitchen in which it was prepared.
I now feel like we have joined their ilk.
I know on the rare occasions where we dine out as a family Donna won't sacrifice a schnitzel for a shake but there's no denying that things are different at home.
Who knows, if kids shakes take off soon enough it might be dinner for one.