The three stages of starvation are the early stage which is 0 to 3 days, the intermediate stage which is 4 to 30 days and the late stage which is 30 days or more.
In stage 1 of starvation, the body uses it's stored glycogen also known as glucose for it's energy and fat burning also begins to increase and muscle breakdown is also minimal.
In stage 2 of starvation also known as the intermediate stage, the body depletes it's glycogen stores and fat becomes the primary source of energy for the body.
Muscle breakdown also increases and the Ketones in your body accumulate in your blood which is also known as Ketosis.
In stage 3 of starvation which is the late stage of starvation, the body breaks down muscle and bone for it's needed energy.
And organs also begin to fail and severe malnutrition and dehydration also occur and death can occur if not treated and you don't eat soon enough.
The duration of each stage of starvation can also vary depending on factors like your initial body fat stores, age and your overall health.
When you skip meals, your body begins to maintain blood sugar levels by degrading the glycogen in your liver and break down stored and protein.
If you stop drinking water death can occur within a few days due to dehydrated before you starve to death.
You can live longer without food than you can without water.
If you stop eating and drinking then death can occur within a few days but if you drink water or drink something you can live longer without food.