Problem to be solved: to provide a flavor balance adjustment method for a liquid food drink which can improve a preferable flavor of a liquid food and drink and reduce or reduce an undesirable flavor, and a flavor balance adjusting agent for a liquid food drink.The method of adjusting the balance of the liquid food and drink products, which is characterized in that the hydrogen containing gas is contacted with the raw material for liquid food. In addition, the flavor balance adjusting agent of the liquid food drink characterized by containing hydrogen containing gas as an effective ingredient.The adjustment of the flavor balance is one or two selected from the group consisting of a sweetness improvement, a taste improvement, a salty taste improvement, an improvement in the chirality, a flavor improvement of the carbonation stimulation, a decrease in bitterness, a decrease in astringency, a decrease in the sour taste, a reduction in acidity, a reduction of the flesh odor, a reduction in the heat odor, and a reduction of the plant odor The above is preferable.No selection【課題】 液状飲食品の有する好ましい風味を向上させることができるとともに、好ましくない風味を低減または軽減することのできる液状飲食品の風味バランス調整方法、および液状飲食品の風味バランス調整剤を提供する。【解決手段】 液状飲食品原料に水素含有ガスを接触させることを特徴とする液状飲食品の風味バランス調整方法。また、水素含有ガスを有効成分として含有することを特徴とする液状飲食品の風味バランス調整剤。風味バランス調整は、甘味向上、旨味向上、塩味(しおあじ)向上、キレの向上、香味向上、炭酸刺激のまろやかさ向上、苦味低減、渋味低減、雑味低減、酸味低減、畜肉臭低減、加熱臭低減、および植物由来不快臭軽減からなる群より選択される1または2以上であることが好ましい。【選択図】なし