Is it possible for someone not to have mood swings?

[Ja sa bong]

I keep thinking if it's possible for someone not to have any kind of mood swings in their lives? There's nothing which can happen and it's going to affect their mood to swing up. Do you think there are some people like that who have complete control over their mood?

[Henrywrites]

All humans have blood running in them and that means that they will always feel a certain way. They can't just help feeling the way that they are feeling. When you look at life and its challenges, you will definitely experience mood swings.