Hm, that’s a hard one.  Let me get my tablet and I can just show you some relevant dietary guidelines:  

Recommended Intakes For Protein
- adult men should get 0.8 g/kg body weight
- adult women should get 0.55 g/kg body weight

Recommended Intakes For Carbohydrate
- adult men should get 45-65% of energy as carbohydrate
- adult women should get 35-50% of energy as carbohydrate

Recommended Intakes For Fat
- adult men should get 20% of energy as fat
- adult women should get 25-35% of energy as fat

Recommended Intakes For Sugars
- adult men should get 10-30% of energy as sugars
- adult women should get 5-15% of energy as sugars

Recommended Intakes For Salt
- adult men should get 2-4 g/day
- adult women should get 1-2 g/day

You can see all those values here, just replace the "%" with the actual numbers and the guidelines are pretty clear.  If your dad were to eat a single donut a day, that would be too much sugar, and it would probably be higher than the
assitant
What are some of the symptoms of diabetes?
assistant
Can my diabetic father have one donut a day?
user