The singer, who was once addicted to working out, only has water and other drinks for almost two days, and says it reduces inflammation, reports mirror.co.uk.
The 33-year-old has taken a go ahead from her doctor friend for this fitness regime. "I do it very safely by having a purposefully nutritious food day the day before and after.
On the fast day, I drink high-grade electrolytes and a lot of water (plus tea and coffee). Fasting is safe and beneficial unless you are diabetic or have serious health issues," she said. "I built my way up to 40-hour fasts over time (started with 12).
Fasting from time to is a great way to give your digestive system a break. It helps blood sugar control, and helps fight inflammation - the mother of all health