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Chris van Tulleken is on a mission to get his twin, Xand, to quit ultra-processed food. It turns out to be far stranger and more emotional than either of them ever imagined...

Chris van Tulleken is on a mission to get his twin, Xand, to quit ultra-processed food.

There’s a growing global addiction to ultra-processed food aka UPF. Chris thinks UPF is driving Xand’s (and everyone else's) weight problem. So, he proposes a simple experiment - that Xand goes on a final week-long UPF binge whilst interviewing the world's leading experts on addiction, food, nutrition and weight. It's the nutritional equivalent of smoking 100 cigarettes whilst going on a quit smoking course. Simple right? Well, it turns out to be far stranger and more emotional than either of them ever imagined...

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4 minutes

How much exercise should you really be doing?

How much exercise should you really be doing?

Chris and Xand investigate the science of exercise and the dangers of inactivity.

Does willpower even exist?

Does willpower even exist?

Chris and Xand examine the slippery concept of willpower.

Can people really change?

Can people really change?

Drs Chris and Xand explore if people can change and how they do it.

How I learned to lose weight and stop fighting with my family

How I learned to lose weight and stop fighting with my family

Dr Xand van Tulleken on his mission to quit eating ultra-processed food.

Podcast