Don't worry - it's not something horrible like small children or sawdust - but the facts are pretty stark.
On average, says the voiceover in the video, a Big Mac contains about 540 calories and out of that, nearly half of it (43%) is salt. It has 29 grams of fat - which is about half your daily allowance. So far, so usual.
But then comes the maths. If you ate a Big Mac every day for a year, you'd accrue a whopping 197,000 calories.
Big Macs are also big business for Maccy Ds. They sell 2.5 million of those burgers a day, 900 million a year, across 36 countries.
But here's the fact that sat uncomfortably in our stomachs (much like a Big Mac enroute home after the pub). Each burger patty can contain the meat of up to 1,000 different cows from across five countries.
We're not lovin' it.Suggest a correction