How can a constructor be called within a construtor in c++11?

I know that we could use MIL to call a constructor in a constructor like the following code. But I would also like to ask whether there are any other methods to call the constructor in a constructor without using MIL? How could I change the following code to call a constructor in a constructor without MIL? Thanks a lot.

#include <iostream>
using namespacestd;
class Food{

private:
        int a; 
        int b;
public:
        Food(){cout << "default constructor" << endl};
        Food(int x = 0, int y ) { a = x; b = y;}; 
        Food(const Food& z) : Food(z.b){cout << "using mil" << endl; };
};

int main( ){

    Food apple; // default constructor
    Food orange = apple; //copy constructor

    return 0;
}```