Because the glutamate is the actual flavor-enhancer, CDG has the same flavor-enhancing properties as MSG but without the increased sodium content.
bɪkˈʌz ðə ɡlˈuːɾɐmˌeɪt ɪz ðɪ ˈæktʃuːəl flˈeɪvɚɹɛnhˈænsɚ, sˌiːdˌiːdʒˈiː hɐz ðə sˈeɪm flˈeɪvɚɹɛnhˈænsɪŋ pɹˈɑːpɚɾiz æz ˌɛmˌɛsdʒˈiː bˌʌt wɪðˌaʊt ðɪ ɪŋkɹˈiːst sˈoʊdiəm kˈɑːntɛnt.