We aimed to assess the efficacy of tongue and body acupuncture with clinical function and brain glucose metabolism in children with a severe type of cerebral palsy. Four children were recruited. The motor function belonged to grade 5 of the Gross Motor Function Measure (i.e., completely nonambulatory). Daily tongue and body acupuncture was applied for 5 days a week for 8 weeks. The Functional Independence Scale for Children (WeeFIM), Clinical Global Impression Scale (CGIS), and positron emission tomography of the brain with [18F]fluorodeoxyglucose (FDG) were performed at baseline and after acupuncture. None of the children had any significant change in the Functional Independence Scale for Children score, despite the fact that all mothers scored 3 on the Clinical Global Impression Scale (i.e., 25% in improvement) in overall function. The brain glucose metabolism, however, showed a >10% increase in the frontal, parietal, temporal, and occipital cortices and cerebellum. Thus, a short course of tongue and body acupuncture was shown to increase brain glucose metabolism, despite lacking any clinical functional improvement seen during the eight-week course, possibly owing to the severity of the motor dysfunction and the short duration of treatment. The objective increase in brain glucose metabolism might serve as a surrogate marker for assessing the subclinical efficacy of an alternative treatment before any objective clinical improvement is evident. A larger-scale study for different degrees of severity of cerebral palsy and an impairment model should be undertaken to correlate clinical with neurometabolic change.