When eating raw, taking in too many calories is unlikely to be an issue. Fatty foods such as avocado will be your friend. When I tried a raw diet without them years ago, though I felt energetic, I lost quite a bit of weight, with much of it likely being muscle mass since I was only about 8% fat to begin with.
It'd be a good idea for you to pick up a book that goes into detail about adapting to a raw diet if that's something you wish to do. You'd do well in getting one of Victoria Boutenko's (author of Green for Life) books, such as 12 Steps to Raw. Doing it just a few days at a time, it's not so critical.
After just three days, you may simply feel better than usual. If you read about adapting to a new level of health, such as when switching to raw foods, you're apt to hear a bit about the "healing crisis" as described below:
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The Road To Better Health may begin with a Healing Crisis
As you move toward better health with natural healing programs and better nutrition, healing begins to occur. As part of the healing process the body will begin to discard toxic residues which have built up in your body over the years. The healing process usually does not occur without repercussions. During the initial phase of healing, as your body begins to clean house, (detoxify) and your vital energy begins to repair and rebuild internal organs, you may experience headache, uneasiness, flu like symptoms and fatigue. It is important that you adequately rest during this time. These symptoms will pass as your body begins to normalize to a new level of health. As you continue to improve, you may begin a process called retracing. You may feel worse before you feel better. For example, if you used to get skin rashes, the rashes may reappear or get worse for a period of time as your body eliminates toxins through the skin. You may also experience an initial increase in urination, or you may feel more nervous. In actuality, you are not getting worse, you are actually getting better. Eventually you will reach a plateau of better health.
During the healing crisis, it is important to not suppress these temporary symptoms with drugs or the healing process may become interrupted."
Basic Healing Principles of Natural Cure
It's good to know about such possibilities beforehand, so it won't be so worrisome if/when it happens. Good luck with whatever you do. Also, rather than having to do a lot of chopping with every meal, you may simply have a few apples or bananas, or maybe half an avocado (love 'em, can you tell?) or a bit of coconut. Making smoothies as in Green for Life will greatly improve things, even if you continue having cooked foods most of the time.