That’s the best advice that many should look up to. I have read a post that asked about the weight gain. They had literally no control over their weight and that resulted in infertility. Even doctor constantly asked many of them to bring their weight to a minimum level. So that would not make a hurdle in their conceiving. I think all the TTC period you must not be overweight. Because this could cause abnormalities at any level. you must consider this thing. Daily exercise and healthy diet would be enough to maintain your weight.