I like the first, so that we know it was completely eaten and he had time to not feel guilty. Although eating seems OK, but it limits it to the same time-- in your sentence, the eating and the feeling are synchronous. (Cf: Although having eaten )
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Mister MicawberAlthough eating seems OK, but it limits it to the same time-- in your sentence, the eating and the feeling are synchronous. (Cf: Although having eaten)