Archive · 7 Oct 2026
Mumbai CEO Describes 90-Hour Birthday Fast and Its Effects
Abhishek Agarwal said he went without food for 90 hours for his birthday.
He shared the experience on LinkedIn as a personal challenge.
He said the fast got harder on the second day, but he felt clear-headed on the fourth.
When people stop eating, their bodies first use stored sugar for energy.
Later, the body uses more stored fat and makes ketones, which can also provide energy.
Some muscle protein may be used too.
People can experience hunger, weakness, headaches, or other problems during a long fast.
Not eating is different from not drinking, but dehydration and electrolyte problems can still happen.
A long fast can be risky, especially for people with certain health conditions or medications, so this account does not show that it is safe for everyone.
Abhishek Agarwal, CEO of CreditVidya and Prefr, fasted for 90 hours around his birthday.
He described the fast on LinkedIn as a personal test of “hunger vs willpower.”
Agarwal said the first day felt easy, the second was harder, and he felt mentally clear on the fourth day.
During prolonged fasting, the body uses stored glucose and glycogen before relying more on fat and ketones.
A 90-hour fast is not safe or beneficial for everyone and may pose particular risks for some people.
- Who
- Abhishek Agarwal, CEO of CreditVidya and Prefr.
- What
- He completed a 90-hour fast and described his experience; the article also explains possible bodily effects and risks of prolonged fasting.
- When
- For his birthday this year; the article does not specify a date.
- Where
- Mumbai; Agarwal shared his account on LinkedIn.
- Why
- He said he wanted to test “hunger vs willpower” as a personal challenge.
- Fast duration
- 90 hours, or almost four days
- Person
- Abhishek Agarwal
- Companies
- CreditVidya and Prefr
- Stated purpose
- A personal challenge to test “hunger vs willpower”
- Reported experience
- Agarwal said the first day felt easy, the second was harder, and he felt mentally clear on the fourth day.
- Possible energy shift
- The body can move from using stored glucose and glycogen toward using more fat and ketones.
- Potential concerns
- Symptoms may include fatigue, headaches, irritability, nausea, and dehydration or electrolyte problems.
- Safety note
- The article cautions that prolonged fasting is not safe or beneficial for everyone and recommends discussing risks with a healthcare professional when relevant.