I always say fasting with water only is not for weight loss, you will gain it back as soon as you ...
I always say fasting with water only is not for weight loss, you will gain it back as soon as you go to your eating habits. Sugar and processed foods have to be totally eliminated from your diet, especially if you have PCOS. Raw vegan diet is what I suggest first, for a month. Building good nutritional reserves will aid you in fasting longer. You are giving up on your fast after three days, which is generally when you are crossing a boundary from use of glucose to Ketones for energy. So after three days you just have to stick it out. You will not hurt yourself if you push a bit.
I also suggest that you do a kidney cleanse, colon cleanse and a liver flush to clean your body first before you fast. People are looking for a quick result, where it took them years to get the way they are in present condition, by eating junk foods, with environmental toxins and thought toxicity.
Take one step at a time.
All questions do not make sense to me. If you are fasting with water only, you are going to go out to eat? Or are you just accompanying someone who is eating out? If latter, then just don't go out. If you must, then tell them you are fasting for health reasons and face the negative and unsupportive statements from all around you, you have to be bold. When I fast I let everyone know around me, I try my best to educate them, those who do believe me it is their problem. I move on.
One should never fast when they are under stressful situation. Your body knows how to maintain energy, but one thing is required is ample rest during a water fast, second drink warm water as per thirst, third don't give your body physical strain. As for mental focus and concentration, it will increase if you fast, go down if you eat and eat junk.
Sorry, I am jumping to conclusions about your lifestyle.
Cleanse your body first, gets micronutrients and then fast.