If I had answered this question a couple of years back, I would have said, "Yes, absolutely....breakfast is the important meal of the day". But now my answer is different - "All meals eaten AFTER you have felt hungry are important meals of the day". I'm not relying on scientific research to back up my answer but more to do with my personal experience.
I have observed that on some mornings, I feel hungry enough to eat a solid breakfast. For eg, after an intense yoga practice today, I was quite hungry and so I grabbed a plate of dosais with dry coconut podi. A couple of days back, although my yoga practice was intense, I didn't feel hungry to eat and so grabbed a glass of vegan banana smoothie. By noon, I was hungry and ate a wholesome, homemade lunch.
I'm slowly shifting my dinner timings to 7PM and so I fast for around 12 hours. I feel light and refreshed in the mornings. I'm no longer eating 3-4 meals based on set timings.
I'm not advocating to skip breakfast. All I'm saying is to listen to your own body and eat only when you are hungry. There will be days when you feel a lot hungry in the mornings. Have some fresh fruits and nuts handy, make a quick homemade breakfast (not the breakfast cereal junk). On days when you are not hungry, give your body some time to finish the work it is engaged in. People who write about intermittent fasting talk about two phases that our body goes through - building phase and elimination phase. This makes a lot of sense to me. Again, don't immediately put me in the bucket of IF/Keto/LCHF and conclude that I'm gonna recommend a tall mug of bulletproof coffee 🙂
I read quite a bit about nutrition and follow the practices that I find relevant and sustainable for me. Please do your own due diligence before jumping onto anything.
Some might say "listen to your body" is nonsense. Let it be, that's your opinion. You could also try to prove me wrong by sharing some research articles.
All I want to convey is that this idea - "listen to your body" is working for me and is guiding me well on what/when to eat.