IF (Intermittent Fasting) is a really great companion to the keto diet if you feel up for a challenge and want to give it a try. Ideally benefits are seen when fasting for at least 14 to 16 hours, but you can start small and work your way up to a comfortable level. You don’t even have to do it for the rest of your keto journey if you don’t want to, but only until you reach your goals. When you’re fasting, not only is your body cleaning and repairing itself, but also melting away the fat it stored and turning it into energy.
There are many types of IF you could choose from, all of them neatly explained all across the Internet. For example, I skip breakfast entirely, don’t snack and only eat two meals a day: lunch at 12 PM and dinner 5 to 6 hours later then fast until 12 PM next day. That’s worked for me and I’m not saying it will work for you; just giving an example.
Everyone does keto differently (dirty/healthy etc.) while following more or less the same principles, but I’d say it would benefit your health and overall well-being if you stayed away from processed foods such as cereal bars and get your nutrients from natural sources.