As said above, it may be carb cravings because of the dramatic reduction in carbs.
Or it may be genuine hunger because he didnkt eat enough carb and protein to last till his next meal.
Both are very easily sorted
If it is carb cravings, then a cup of bovril or coffee, each with a dash of cream will always kill cravings for me.
The trick is simple - fat kills cravings.
And when the cravings disappear after a few days, it is natural to forget to have the extra coffee and bovril.
If it is not eating enough, then bigger portions are an even easier solution.
One thing you said is very telling
Guzzler has already laid that to rest. It is most definitely NOT inevitable.
My way of eating is very high in saturated fat, red meat, and very low carb, and mt cholesterol is at the national average for total cholesterol and my ratios are optimum (at last test).
In fact, rapid weight loss is one of the main reason for cholesterol to rise when people go LCHF. Yet healthcare professionals always seem to blame the high fat diet for rising cholesterol hdespite it being proven that dietary chol only affects 15% of total chol). When the chol rise is actually from the weight loss that the LCHF diet produces. Ironic, eh?
Incidentally, when chol does rise with rapid weight loss, it drops again once the weight settles.
I know that your role as a loving spouse is to protect your beloved from the horrors and terrors of fat. That role was assigned to us 50+ years ago. It is like gravity. Almost irresistible.
But that was all based on faulty science.
https://idmprogram.com/diet-heart-hypothesis-hormonal-obesity-xxxv/
It isn’t good fats (butter, olive oil, meat fats) that cause the problems. It is the bad fats (processed, trans, polyunsaturated veg oils) PLUS too many carbs.