Everything you are saying is pointing to starvation induced metabolic disease.
You said it yourself that you were always starving as a vegan. Given that you were a "good" vegan, living on low calorie foods, I cannot see how you think you ate more calories, but were starving.
If you told me you had a 150kg squat, 200kg deadlift and did 6+ hours of hiking every week, but still had issues with weight and always felt hungry, I would be quite surprised, because there's no way you could maintain maximal force production with low calories. All of that muscle would also not be there with low calories.
Vegan food is rich in carbs, so saying you cannot metabolize short chain fatty acids is irrelevant when most of your calories came from carbs. Your body can turn these carbs to fatty acids that your genes can deal with (to create hormones, if you had enough protein too). If we think about essential fatty acids, then your hypothesis is testable, either by taking a long essential fatty acid supplement (EPA + DHA), or by measuring your EPA/DHA plasma levels after consuming ALA rich plant oils like flexseed (not olive oil, and most definitely not sunflower oil). Still, no way deficiency of ALA metabolites is going to put you in a weird starvation mode. It's the starvation that is causing your metabolism to shutdown. Of course you will have trouble metabolising ALA if you are starving.
Yes, it's not about food, it's about calories. Individuals that want to function well need to eat enough. If your issue was short fatty acids, then it's quite impressive that your diet fixed it. Long fatty acids are not essential, and to function you need to be able to create metabolites from short fatty acids, because not all long fatty acids required for human hormones and metabolism are present in your food.
Not being satiated is also a sign of having low calories on a "good" vegan diet.
If you ate 500 grams of raw beans (cooked), having 1.5kg of excrement going through your bowels will leave you quite satiated.
On my plant-only days, whenever I eat that much volume of food to get to 3500kcal (I weigh 220lbs and eat 4000kcal+ on regular days), I am basically satiated after first 2000kcal for the whole day and have to force myself to eat more. This is whole plants, no oils.
Of course, the massive poop next morning makes it worth the trouble :D
You said it yourself that you were always starving as a vegan. Given that you were a "good" vegan, living on low calorie foods, I cannot see how you think you ate more calories, but were starving.
If you told me you had a 150kg squat, 200kg deadlift and did 6+ hours of hiking every week, but still had issues with weight and always felt hungry, I would be quite surprised, because there's no way you could maintain maximal force production with low calories. All of that muscle would also not be there with low calories.
Vegan food is rich in carbs, so saying you cannot metabolize short chain fatty acids is irrelevant when most of your calories came from carbs. Your body can turn these carbs to fatty acids that your genes can deal with (to create hormones, if you had enough protein too). If we think about essential fatty acids, then your hypothesis is testable, either by taking a long essential fatty acid supplement (EPA + DHA), or by measuring your EPA/DHA plasma levels after consuming ALA rich plant oils like flexseed (not olive oil, and most definitely not sunflower oil). Still, no way deficiency of ALA metabolites is going to put you in a weird starvation mode. It's the starvation that is causing your metabolism to shutdown. Of course you will have trouble metabolising ALA if you are starving.
Yes, it's not about food, it's about calories. Individuals that want to function well need to eat enough. If your issue was short fatty acids, then it's quite impressive that your diet fixed it. Long fatty acids are not essential, and to function you need to be able to create metabolites from short fatty acids, because not all long fatty acids required for human hormones and metabolism are present in your food.