During cell division, new molecules come together to form a new cell from a pre-existing cell. In other words, the DNA of the original cell acts as a template for the daughter cell's DNA. While new matter is being created (i.e. a new cell), the content used to make that cell (nucleotides, proteins, etc.) originated from some other source. For instance, during cell division, you need various enzymes - remember that enzymes are proteins made up of amino acids. Those amino acids originated from an outside source, like the food you consumed. The nucleotides that come together to form the new DNA of the new cell being made also came from an outside source or were made by the body from other sources also, such as nitrogen and sugars found in the food you act. Therefore, cell division isn't necessarily creating more matter out of nothing, but it's a process that involves the recycling of matter from various sources. Think of it this way, if the body continually produced new cells without any of the pre-existing cells dying naturally, you'd get bigger and bigger in size and things wouldn't work out naturally. Every cell that dies gets recycled and reused somehow to replace it.
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