Always be sure to think critically when reading / hearing recent 'fitness claims'.
Because they NEVER explain the whole story or will show you the bigger picture!
In this instance: a huge lack/ misunderstanding of the role of cortisol in ACUTE terms Vs CHRONIC terms. They are different! 
Cortisol has an important role in the body which keeps us healthy, functioning normally, and is essential. But chronically high levels can have a negative impact on health, well-being, and yes, can prevent fat loss & has a role in storing fat around your stomach.

But short answer: No. HIIT training will not stop you from losing fat. 

Feel free to message me on insta if you have any Qs from this episode! @maddison_woods_making_waves