Fun facts: If a person swallowed an average of 3.4ml (about 3/4 a teaspoon) of cum 10 times a day 10 days a month for two years (2400 loads) would be 8.16 liters or over 2.1 gallons of cum.
Going by this source: ZZZhttp://jezebel.com/a-complete-breakdown-of-the-nutritional-content-of-seme-953356816
The nutritional content of that would be:
Calories 1680
(7 for ten loads each day of servicing: .35% RDA)
Fat (unsaturated) 14g
(.06g for ten loads each day of servicing: .1% RDA)
Cholesterol 7.2g
(30mg for ten loads each day of servicing: One egg has 212 mg)
Sodium 24,480mg
(102mg for ten loads each day of servicing: 4.4% RDA)
Total Carbs 24.4g
(.1g for ten loads each day of servicing: .07% RDA)
Protein 410g
(1.7g for ten loads each day of servicing: 3.6% RDA)
Zinc 576 mg
(2.4mg for ten loads each day of servicing: 30% RDA)
Cut the 2.1 gallon numbers in half and you'll get the nutrition for about one gallon. As you see, if you tried to live off of it you'd need about 2K loads a day (nearly 2 gallons) to get the calories you needed just to sit around, and at 800% + RDA of sodium that would kill ya. So if someone wants to try this they'll have to get most of the salt out first..low-salt cum.
To get all of the protein you'd need (about 45g) for one day from cum you'd need almost .935 L of cum. (about 275 loads worth) And with that you'll get about 2800 mg of sodium. You'd be at only 192 calories. But if someone wants to get all of their daily protein from cum it's possible, though a little high in sodium. You'd have to eat something else, too, which probably will also have sodium in it.
This was fun playing with the math, thanks for reading.