Overall, everthing sounds pretty good, but It's still early for some of the side effects to go away, some take several years or longer, but getting adequate nutrition, hydration, is important for recovery and healing. The cancer center is probably doing the blood labs (creatinine, hemoglobin etc), which may show some deficiencies, which can effect energy levels, some even appetite, so correcting them or over time may help. Sometimes vitamin D, B12, testosterone are not part of these basic blood tests, so check/ask, as these can also effect energy levels. As far as thyroid, the risk of hypothyroidism increases over time the longer out from radiation. I'm 5 years out from my initial treatment, a few years from others, and just developed hypothyroidism, but can occur earlier. They recommend to be tested at least twice a year.

I lost over 110lbs just from chemo in 2009 (cachexia), but gained some back, lost again, between 50-70lbs, after several years. Some of the things that helped increase my appetite was watching the TV food shows, reading about food, caffeine, Marinol, corticosteroids, fat, sugar, wine (after a few years). There are others too, but either I didn't do it or can't recall. Amino acids, omega 3 fatty acids, melatonin, whey protein, using peg tube to supplement diet, may also help with weight gain, reversing metabolism, but check before doing.

There is more to food than just eating, and have incorporated seeing, smelling, hearing, memory, textures, besides tasting, into my dining enjoyment, in addition to the different taste senses. I'm just getting around to finally tasting the sweet in fruits, ice-cream, etc, and salt is either too salty or not enough. If food doesn't look good u won't eat it or much of it. Same goes for presentation, etc. All sounds well, and good, but this was mostly several months after Tx. I survived on glucerna for a long time during, after Tx.

Maintaining proper oral care is also important for oral/dental health, and helps reduce infection, such as thrush, which can effect taste, and cause fatigue. Pain control is beneficial too, which can effect eating, desire to eat.

Light exercise like walking may help increase the appetite. Maybe see your centers registered dietician for help with diet, minimum daily requirement.

Good luck, and hope this helps.