Gingerkittykat that's my experience too, though without the diabetes.
My parents live their entire lives around 3 meals per day and did even when I was a child and they were working in professional carers. Everyone and everything had to stop for set meal times, lots of pleading and coaxing of "fussy" sibling to eat, lots of praise for "goodeaters" but simultaneously limiting of the portion size of girls once they hit puberty to a smaller plate and half of everything - half a patie, half a sausage roll, half a slice of toast, half a croissant, pudding as a bribe for a clear plate at the main course, not eating breakfast or missing or not "trying to manage" to eat all of a meal regarded as similar to mooning the vicar at family communion, "Sunday dinner" being a roast absolutely non negotiable even on the hottest summer day, or a really busy day, or a day everyone was unwell... Snacks aside from fruit (mainly apples) not allowed or strictly rationed with great theatre (yet at boarding school biscuits were handed out by the school daily as I mentioned up thread).
It did nobody any good. Family rife with eating disorders. Constantly felt disgruntled and dissatisfied at getting less than I wanted of things I liked but having to finish things I didn't.
I've grown to loathe the "I couldn't possibly manage all this" drama that some people act out around every plate of food and would rather have nothing than half of something I want the whole of!
I'd rather eat one really hearty, good, tasty meal per day and feel satisfied and happy than three unsatisfactory little bits which leave me hungrier than before because they're refineded carbohydrates like toast and jam or cereal or just because psychologically expecting to eat and getting "a few bits" (a typical example being two cherry tomatoes, a piece of cucumber, a couple of scraps of lettuce, half a sausage roll, half a slice of bread and a sliver of cheese) is just a taunt!
Eating little and often is unsatisfying, leaves people constantly thinking about food and doesn't give the body a break from digesting.
I'm not sure why huter gatherers are held up as a good example - not only did they have a short life expectancy, its also not remotely comparable to how people now eat little and often - hunter gatherers wouldn't have been eating after dark on a regular basis, nor did they probably have breakfast before their equivalent of "work"...
Healthy adults and older children don't need to eat more often than they want to, whether its once or six times per day. Nothing bad happens if you cut out breakfast. In fact most people will be less hungry by late morning if they've been fasting since dinner the day before than if they ate cereal or toast at 7am.