The 51-year-old Good Morning Britain admitted during an interview with fitness trainer Joe Wicks that she had piled on the pounds during the COVID-19 pandemic and was having trouble getting back in shape.
Reid told Wicks: "Obviously during lockdown you did, basically, national service for all of us by keeping us all fit.
"The fact of the matter is that lockdown has had a massive impact on people. Despite all of that, and the fact that we could get fit online, we do face an increasing obesity crisis."
"I found it really hard to shift those pounds."
Reid — a single mother to three teenage sons Sam, Finn and Jack — worked throughout the coronavirus pandemic presenting Good Morning Britain.
Reid told co-anchor Richard Madeley: "I once asked him how to lose weight — we have history me and Tyson — because he did this remarkable thing where he lost a huge amount of weight and got himself back fighting fit.
"And I said what was the key and he said, 'Susanna you just have to give up milk in your coffee — you're drinking too much milk in your coffee'.
She added, holding up her cup: "So just to confirm — it's completely black this morning."
Reid added: "It was an excellent tip. Unfortunately I can't stop with the takeaways in the evening."
The TV presenter has previously revealed she is the target of "horrible and toxic" abuse on social media as a result of being in the public eye.
She said: “Obviously there are moments when I’m upset or I beat myself up about getting something wrong – and there are things that frighten me – but we do a good job and we enjoy what we do. I have moments of self-doubt, but I’ve been doing this a long time now.”
Watch: Susanna Reid shares weight loss tip from Tyson Fury