I used to believe that three evenly spaced meals were important for everyone, but now I'm not so sure. I think even that varies from person to person.
I've found for myself that no-meals works great (six to eight snacks instead of meals, none of them more than 400 calories, and most of them around 200). It helped me break the habit of feeling the need to be "full" after a meal. Now I'm never full, but I'm never starving and I'm never uncomfortable, either.
Other folks swear by IF (intermittant fasting), where they distribute their daily calories in a relatively short period of time, usually late afternoon to early evening.
I think research is too focused on finding a one-size-fits-all approach. Most research assumes that people's physiology is more alike than diverse - and I'm not convinced that's true. I think there's a huge difference between a healthy teen with 10 lbs to lose, and a middle-aged person with diabetes, thyroid issues and other issues with 150 lbs to lose.
I think there's more diversity than similarity, and until the science catches up, folks are left with trial and error.

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