func File(filename string) Nutrition {
	return newFeeder().File(filename)
}
Build Nutrition instance that decodes given File.
Do nothing if file does not exists.
package nutrition
import (
	"bufio"
	"fmt"
	"io"
	"os"
	"reflect"
	"regexp"
	"strconv"
	"strings"
	"time"
)
func Env(prefix string) Nutrition {
	return newFeeder().Env(prefix)
}
func Reader(reader io.Reader) Nutrition {
	return newFeeder().Reader(reader)
}