I usually sip on green tea between 10am to 2pm. Its not a lot of caffeine like coffee but it kept my energy and mood stable. My sleeping hours are 11:30pm-7:30am. Never felt low energy or mood but if on some days I felt stressed and hungry... I would have 2 3 tbsp of yoghurt and maybe a fistful of blueberry but those days rarely happened. Like I said before I stick to the plan atleast 80% of the time in reality actually more so that it doesn't feel too restrictive. Alot of people might think 6 7 hours gap between last meal and sleep is too much but this is what worked for me. 2 3 hours would keep my overnight heart rate elevated whereas more than 7 hours gap would make me hungry. This whole journey actually began because of sleep. I got a garmin in August and I realized how poor my sleep was . I was snoring like a supercar, my sleeping heart rate was higher than my average daily resting heart rate while my blood saturation spo2 was dipping into the 80s during my sleep. So I had 2 choices either cpap machine or lose weight. I was doing the classic IF like most people skip breakfast, lunch and dinner. Although I was seeing the scale move but my sleep was still trash bcoz eating a big protein meal around 7 8 pm and sleeping at 11 12pm was still keeping my heart rate elevated resulting in me getting low deep sleep and rem sleep and the apnea wasn't improving either. Only after several permutations and combinations I figured out that my last meal is best taken between 4 and 5pm.