It thought to be the origin of the dietary culture, offering food to God, eating with God and social intercourse with the neighbors through foods. The diet represents the life of the generation, because diet must be formed with the progress of human beings and the structure of the society. In this report I would like to introduce the knowledge of the ancestor: festival thanking for foods, five seasonal festivals, and 24 periods in four seasons. There has been custom taking season's “Osechi” with the information taught by nature. I would like to tarnsfer the knowledge of ancestors: “Sakura mochi”, “Kasiwa mochi”, and so on, which were enveloped by season's leaf for conservation and fragrance.
At presente, 40% of the people in the world take foods by hand, but in Japan there has been chopstick culture frome ancient age. The chopstick is functional and hygienic, of course, but also constructed dietary manners. Especially dietary manner in “Sadou” and “Zen” handed down to present as wide spread proprieties and spirit, and was the element passed on to us the spirit of “Zen”. The Japanese characters cooking means measuring reason (Kotowari) . It means that the basic solicitude is to make it easy for the person to take food. This is the Japanese dietary culture. I would like to pass down the ceremony “Kuizome-zen” or “Hagatame”.
After the WWII economical interaction made great influence on the dietary culture, and caused confusion of the Japanese dietary culture. In this century 21, the culture will be the information dietary culture including the traditional custom.

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This study was examined the functional change in the auditory pathway caused by increased jaw vertical position at upper and at lower point of the free-way-space. Then, we investigated the mechanism of response in auditory pathway accompanying with increasing of vertical dimension, focusing on the outer-hair-cells-activities in cochlear, between jaw closed position (V₀) and 3.0 mm vertical increased (V₃) and 5.0 mm vertical increased (V₅) which were standardized on articulator, each vertical dimensions on articulator were calculated at incisor point showed 2.30 mm ±0.19 in range of V₀ to V₃, 3.68 mm ±0.30 mm in range of V₀ to V₅, distance of V₀ to V₃ was located in the range of free-way-space, and also distance of V₀ to V₅ was over the free-way-space but was in the range of terminal-hinge-movement. At these three vertical positions, that were at V₀ and at V₃ and at V₅, neuro-otological examinations were done as follows: (1) Activities of the outer-hair-cells in cochlear were evaluated by DPOAE-gram (threshold level of distortion-product otoacoustic emission) using GSI-60 system (Grason-Stadler Co.) in the frequency wave band from f₁1250 Hz 5031 Hz. (2) And responses on stapedial muscle were examined with SR (by acoustic-stimuli) using GSI-33 middle ear analyzer (Grason-Stadler Co.), it proves as threshold level and latency L₁. (3) The changes of middle ear compliance were measured on tympanogram using impedance meter SI-501 (Morita Co.), it proves as the static compliance in tympanic membrane (STC), peak pressure (PRS) and volume (EAC) in middle ear cavity. Those data were gathered from eleven healthy dentulous persons (male, average 24.5 years old, 22 ears), and were analyzed by Wilcoxon's ranks test for comparing with values at position V₀.
We obtained the following results, the differences of values between V₀ and V₃ and also between V₀ and V₅ are significantly noted as follows: (1) STC was increasing significantly with jaw opening and showed the difference between V₀ and V₃, between V₀ and V₅ noted. (2) DPOAE value was also increased and showed significantly difference between V₀ and V₃, between V₀ and V₅, it was limited frequency at the band in f₁ 5031 Hz, it suggests that threshold range in outer-hair-cells located at nearest basement in cochlear. (3) However any difference of values in PRS, in EAC, in threshold value, and in latency L₁ weren't noted.
A worthy finding is the changes of DPOAE at band in f₁5031 Hz, which means that the increase of vertical dimension stimulates trigeminal ganglion that sends projections to tympanic nerve, at the same time, the outer-hair-cells on cochlear basement, without any functional derangement in crossed olivo-cochlear bundle.

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This study tested the hypothesis of whether the lack of tooth eruption would affect the masticatory function. For this purpose, we recorded the jaw movement trajectory in the three dimensions and electromyographic (EMG) activity of MAS and DIG muscles in freely behaving osteopetrotic (op/op) and normal mice. A masticatory sequence was divided into food intake and mastication periods, and 10 cycles in the latter stage were selected for analysis. Mean values of total cycle duration, closing phase duration and opening phase duration were obtained from the jaw movement and those of onset time, time duration and amplitude were obtained from the EMGs of the MAS and DIG muscles. The protruding phase coincided with the power stroke lacked in the op/op mouse. The total cycle duration and opening phase duration were longer in the op/op mouse than normal mouse. The pattern of MAS muscle activity in op/op mice was similar to that in normal mice while the duration of the DIG muscle was longer in op/op mice than normal mice. Our results indicate that the periodontal receptors play an important role in the completion of masticatory function.

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