It is. I haven't eaten breakfast for 20 years, and I don't suffer from any kind of lethargy, tiredness or hunger. I even cycle to work for 30 minutes each day, on an empty stomach, and often don't eat until 1PM. For me, it's actually the other way around: if I eat anything before lunch time, especially sugary things, I often get nausea.

So I guess that confirms your point, there simply is no 'one-size-fits-all answer', everybody has different metabolism. Obviously some things are clearly bad for you, like overeating, insufficient dietary variation, lack of essential nutrients, etc. But these are simply solved with just common sense. For the rest, 'nutrition science' is completely worthless IMO, and more often than not driven by marketing or scientific echo-chambers.

I tried that when I was having lethargy problems mid-morning, but my digestive system doesn't seem to switch on until a while after waking up and if I consume anything more solid than milk before it tells me it is ready I get unpleasant indigestion feelings.

I tend to get hungry and have my first food at ~1030 or a little before. The exception is the days I have a long run into work (a 7.5-to-10K slow run, instead of the usual 2ish Km walk) - I want food as soon as I've showered in that case.

Exercise before work has itself cured the lethargy problem it would seem and it doesn't need to be as strenuous as a 7+K run. Just the difference between the old routine of cycling in, to doing a few situps & dips before getting dressed and briskly walking in, seems enough to make a marked improvement even into the late afternoon.

I'm 6'2" and broad, and thick. I've had a great friend from childhood who's 6'2" and skinny as a rail. We could not have more dissimilar ways of eating healthfully, but doesn't that make sense when you think about it? He basically eats little meals all day, and I concentrate my calories so that I don't stay constantly hungry and engaged in eating.

The only advice that's truly universal, is that you can't lose weight unless the equation is (Calories-In - Calories-Out) = Gain/Loss. How you get there is totally individual though.

So, another myth - carbs are bad at night - that did not apply to me.

After some rudimentary data science liberally using the glucometer, I can tell you what my body does after all types of simple sugars as well as some complex sugars... And my limit per day is around 10g carbs. I will change this up to reintroduce some foods I may not normally eat (like high fiber low carb bread, or Ryvita rye crisps).

When I was initially diagnosed, my fasting was 161mg/dL and a1c=7.1 . Now, my blood sugar when I wake up in the morning is around 85-105, which is normal. I've also lost 50 lbs

See, losing weight fixes many numbers.

After 6 days of low carb diet, my hunger went down dramatically, and I started to feel better. I started to notice weight loss around day 10.

Now, the more I study about T2 diabetes, my 'guess' is that it's a metabolic disease. Someone who's T2 gets high blood sugar, the sugar is eventually processed to fat, causing extreme hunger when the glucose is out of the body (back to normal levels), causing the person to eat more carbs.

That would also explain why things like the Atkins diet does work for certain people; it works for those whom are predisposed to T2 diabetes. It doesn't work and can harm greatly those whom aren't susceptible to T2...

But that's my pet theory.

The big open question is what causes it.

I do believe that carbs are bad with people with broken metabolisms (poor insulin sensivity, poor glucose control, etc), but once you have that fixed, carbs are an excellent source of nutrients and energy. Again, that was my case (38 years old at that time; 45 now)

Of course, both of these big ideas don't make good books or TV shows or special diet products.

There are very few of those good prospective and long term studies. And way too few have follow up study.

The wisdom has to be applied "Bayesian" style ... "Given subject with attributes x, y and z, apply optimisation function."

Perhaps eat much less meat that Standard American Diet. Sure, high protein diets tend to cause rapid weight losses, but there is not enough trustworthy data to ascertain their long term safety and effects.