why is my cat looking out of sorts, although he is eating ok and enjoying his titbits?

my 4 year old cat, Ronnie has seems a bit out of sorts last 24 hours. he has eaten nearly normally, but not gone out although he loves to be out usually..and not playing with us with his favourite toys. he lets me touch him all over and doesnt seem to be in pain ...can you help me? thank you
 
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