I figured getting paid to spend a whole day eating McDonald's would be a bit of fun.

But let me tell you - tucking into what felt like an endless, Olympic-sized buffet is just about as far as you can get from a ‘happy meal’. So, what exactly did I have to tackle?

Last year, to celebrate the start of the 2024 Paris Olympics, I attempted to step into the world of Olympic swimming legend and six-time gold medallist Ryan Lochte. Granted, swimmers don't actually wear shoes, and given the food overload I was about to face, squeezing into his Speedos was definitely off the table.

The towering 6ft 2in American claimed he earned his medals - including two golds and two bronzes at the 2008 Beijing Games - while living off a brutal diet of McDonald's morning, noon, and night. So against my instincts, I dived headfirst into what quickly spiralled into a ketchup-soaked horror show.

Breakfast

  • Two sausage and egg McMuffins, two bacon rolls, one breakfast wrap, three hash browns, and a fruit salad

I used to feel a rush of giddy excitement as a kid when the golden arches above McDonald's came into sight. That familiar buzz of fast-food anticipation. But stepping into the Sydenham Maccies in south London, all joy vanished. After all, I was here for business, not pleasure.

Ryan Lochte with his medals in 2008
Ryan Lochte won two gold and two bronze medals on the McDonald's diet

My first mistake of the day, apart from agreeing to this in the first place, was taking my breakfast to go. I typically don't eat before noon, and thought I'd give my stomach a bit more rest before the madness began. But all that really did was cut short my desperately-needed recovery windows - and turn my eggs into a rubbery mess!

By 10am, I began with the bacon rolls. For a fleeting moment, I felt a spark of joy flutter through my tall, pseudo-swimmer-like (if I squint hard and pretend I’ve got abs) 6ft 5in frame. It didn't last. The hash browns were a nice crispy reset after all that bacon. No issues there, so I moved on to the McMuffins.

Immediately, my gut started to rebel. The egg had turned gluey and clung to my throat like overcooked pasta tossed at a wall. I don’t even enjoy eggs. Why had I signed up for this again?

I picked up the pace - trying to cram the food in before my body could protest. I knew I needed rest soon, because lunch wasn’t far off. The idea of doing a few laps in a pool after this? Hilarious. Especially when (checks notes) I had another five burgers to go.

Lunch

  • 18 Chicken McNuggets, one double cheeseburger, one Big Mac

Harry eating McDonald's
Mid-way through his second meal of the day and Harry is seriously struggling

With my gut feeling like it was stuffed with insulation foam, I delayed the next round until around 3pm. It turned out to be even heavier and greasier than breakfast. The nuggets went down fairly easily, but I was nearing max capacity.

Halfway through the double cheeseburger, I felt an unsettling heaviness, like a lead weight was attached to my waist by a chain soaked in cooking oil. Relish started dripping like a ticking clock - splat, splat - from the bun while sweat trickled down my brow. I was in trouble.

I didn't finish that cheeseburger until 4:15pm. Across the table, the Big Mac sat there menacingly. I had to stop for a break. That was my second mistake.

It wasn't until just after 6pm that I summoned the will to confront the Big Mac. By then, it was about as cold as the look my partner gave me when I told her about this venture. But the clock was ticking and another meal loomed, so I ploughed ahead.

I downed the Big Mac in three bites. Yes - three. Pushing the pace edged me closer to the finish, but sapped what little energy I had left. My thoughts were cloudy, and my stomach felt like it had a soaked burlap sack of coal sloshing inside. I was woozy, drained, and desperate for mercy. Every fibre of my being yelled 'Stop or we're ejecting everything!' But in the name of dumb dedication, I told myself to suck it up.

Dinner

  • 18 Chicken McNuggets, two double cheeseburgers, one Big Mac, one portion of fries

McDonald's food on a tray
In total, the three meals equated to roughly 10,000 calories

By the time dinner rolled around, I was sweating grease, oozing sauce, and physically falling apart. But with the end finally in sight, I felt a flicker of resolve.

I waited until 10:35pm (my third mistake) to start the final - and worst - round. That left me less than 90 minutes to crush the rest. I tried spreading the burgers out over time, but it barely helped. I felt like a human grease trap.

At 11pm, I'd only managed one burger and a few fries. Nowhere near enough. I pushed harder. I inhaled half the McNuggets, then tackled the other two cheeseburgers as my arteries wept. Every chew was an ordeal. The burgers tasted like oil-soaked dish sponges and the fries were limp beyond hope.

Glancing at my phone - 11:48pm. Still to go: one Big Mac, six nuggets, and half the fries. It looked impossible. But then came a surge - like Will Smith clapping Chris Rock. I wasn't giving up.

Lochte in the water
Lochte is one of USA's most celebrated swimmers

I balled the fries into a wad and shoved them down. Then came the Big Mac - gone in four giant chomps. My stomach was churning like a broken washing machine trying to find room for more. I felt horrible. But I had to finish.

By 11:58pm, all that remained were six nuggets. But I was on the verge of bursting. I crammed them in. Finally, I was done but the challenge had taken its toll and underlined something very clear: I am not an Olympic swimmer. And based on this experience, I never want to become one.