Where did the custom of having three meals a day come from?

I know that in this country, it's now the norm to have three meals a day, breakfast, lunch and tea. But has it always been this way? Is it like this in other countries too?

Thanks for reading and any responses.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).