How many D-cell batteries would it take to power a human for 1 day?

All numbers must be entered as 5000 or 5e3 or 5.0e3 and not with commas as in "5,000" and not as fractions as in "3/4" and not as percentages as in "70%".

Estimate the recomended daily food intake (in Food Calories).

Estimate the daily energy (in joule) a human needs.

Estimate the voltage (in volt) of one D cell battery.

Estimate the charge (in amp-hours) of one D cell battery.

Estimate the energy of one D cell battery (in watt-hour).

Estimate the number of D-cell batteries it takes to power a human for 1 day.