The answer is, it depends on several factors, like the person's age, size, and overall health. Generally, a healthy adult can survive for several weeks without food, as long as they have access to water. But, if they're physically active or living in extreme temperatures, their survival time will be much shorter.
For example, Mahatma Gandhi survived for 21 days without eating during a hunger strike. But, he was also drinking water and getting some rest, which helped him survive for that long. It's like his body was in energy-saving mode, and he was able to stretch out his survival time.
How Long Can a Human Survive Without Food? Key Facts - Battlbox.com
On the other hand, if someone is lost in the wilderness without access to water, their survival time will be much shorter. They'll need to find a way to find food and water quickly, or risk serious health problems. It's like their body's emergency alarm is going off, and they need to take action ASAP.