Real-world McDonalds burger experiment

You’ve probably seen the McDonalds burger experiment done many times on YouTube before, but there is always the question of can this really be real? Can it be true that burgers and fries from McDonalds will never go mouldy, or decompose like other natural whole food does?

If it is true that it remains the same as day 1 indefinitely, should we really be eating it? More importantly, should we be feeding it to our children, and rewarding them for eating it with a plastic toy?

I’ve decided to run the experiment for myself, and see what happens when I keep a McDonalds happy meal consisting of a cheeseburger and fries at normal room temperature.

Here is the McDonalds happy meal on Day 1 – the 10th September 2014:

These are the conditions that mould needs to grow:

  • Moisture
  • Nutrients
  • Warmth

Kids love McDonalds Happy Meals, partly due to the collectible toys. which is a clever marketing ploy that the fast food chain use to make their salty, greasy fast food fries an burgers appeal to a very young audience.

Scientists hypothesise that we like eating highly calorific foods such as burgers and fries, because our brain assumes that due to the high calorie content, they are also a good source of other nutrients, and this is often not the case at all.

By targeting children at an early age and including a free toy with the Happy Meal, fast food manufacturers such as McDonalds are able to anchor emotional states of excitement with consuming their fast food.

Fast food chains are not completely to blame, but is it any wonder that conditioning of children over the years to crave high calorie foods has resulted in an obesity epidemic throughout the western world?

I’ve left this McDonalds Happy Meal (consisting of a small portion of french fries, and a cheeseburger) in a warm room. It is not refrigerated. Let’s see what happens over the coming days and weeks!

Day 2


The fries look like they have dried up a bit. The burger bun feels like it is going hard.

Day 3


Not much change since yesterday.

Day 13

Still absolutely no signs of mould or decomposition of the McDonalds burger or french fries.

Day 70

Still no change. Why do McDonalds put azodicarbonamide in their burger buns? The same ingredient used in yoga mats to make them springy. Also why is there so much preservatives in their buns that they never go moldy? Surely they get through enough buns being a fast food restaurant that mold shouldn’t be a concern?

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