The USDA created the food pyramid to encourage a healthy diet, but the USDA also has a mission to encourage agricultural products grown in the US. There can be a LOT of conflict between those two goals. So the food pyramid (ahem, I mean MyPlate) is not simply an objective summary of the available evidence.
The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.
1 The abnormal plantar reflex, or Babinski reflex, is the elicitation of toe extension from the wrong receptive field, that is, the sole of the foot. 2  Thus a noxious stimulus to the sole of the foot produces extension of the great toe instead of the normal flexion response. The plantar reflex is a nociceptive segmental spinal reflex that serves the purpose of protecting the sole of the foot. 2  The clinical significance lies in the fact that the abnormal response reliably indicates metabolic or structural abnormality in the corticospinal system upstream from the segmental reflex.