int EndOfTurn(int varTurns, int varFatness)
    {
    	varTurns--;

    	if (varTurns <= 0) {
    		varFatness = varFatness - 5;
    	}
    	else {
    		varFatness += 2;
    	}
}

TYPE_HERE EndOfTurn(int varTurns, int varFatness)

void EndOfTurn(int* varTurns, int* varFatness) { ... }

typedef struct { int turns, int fatness } ReturnType;

ReturnType EndOfTurn(int varTurns, int varFatness) {
  ReturnType foo;
  foo.turns = varTurns-1;

  if (foo.turns <= 0) {
    foo.fatness = varFatness - 5;
  }
  else {
    foo.fatness = varFatness + 2;
  }
  return foo;
}

typedef struct { int turns, int fatness } ReturnType;

void EndOfTurn( ReturnType* param ) {
  param->turns--;

  if (param->turns <= 0) {
    param->fatness -= 5;
  }
  else {
    param->fatness += 2;
  }
}

void EndOfTurn(int* varTurns, int* varFatness);

*varTurns = *varTurns - 5;

int otherFunctionVarTurns;
int otherFunctionVarFatness;

...

EndOfTurns(&otherFunctionVarTurns, &otherFunctionVarFatness);

struct turn_state {
    int varTurns;
    int varFatness;
};

void EndOfTurn(struct turn_state *state)
{
        state->varTurns--;

        if (state->varTurns <= 0) {
                state->varFatness -= 5;
        } else {
                state->varFatness += 2;
        }
}

struct turn_state current_state = { /* initial values */ };

/* ...code... */

EndOfTurn(&current_state);

(NSDictionary *)EndOfTurn:(int)varTurns withFatness:(int)varFatness

    {
        varTurns--;

        if (varTurns <= 0) {
                varFatness = varFatness - 5;
        }
        else {
                varFatness += 2;
        }

    return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:varFatness],@"FATNESS", [NSNumber numberWithInt:varTurns],@"TURNS",nil];

}

int varTurns = [returnedDict objectForKey:@"TURNS"];