ATP	Adenosine Triphosphate
BDNF	Brain-Derived Neurotrophic Factor
BHB	β-Hydroxybutyrate
CCH	Chronic Cluster Headache
CGRP	Calcitonin-Gene Related Peptide
CH	Cluster Headache
CKD	Classic Ketogenic Diet
CoA-SH	Coenzyme A
CSD	Cortical Spreading Depression
EP	Evoked Potentials
DRI	Dietary Reference Intake
EFSA	European Food Safety Authority
GABA	Gamma-Amino Hydroxybutyric Acid
GLU	Glutamate
GLUT-1	Glucose transporter protein 1
HCA2	Hydroxy-Carboxylic Acid Receptor 2
HDAC	Histone Deacetylase
KATP	Adenosine triphosphate-sensitive potassium channels
KD	Ketogenic Diet
LCHF	Low-Carb High-Fat
LGIT	Low Glycemic Index Diet
MAD	Modified Atkins Diet
MCT	Medium-Chain Triglycerides
MCTD	Medium-Chain Triglycerides Diet
MetS	Metabolic Syndrome
miRNA	Micro RNA
MKD	Modified Ketogenic Diet
MOH	Medication Overuse Headache
Mn-SOD	Mitochondrial Superoxide Dismutase
NAD+	Nicotinamide adenine dinucleotide (oxidized form)
NADH	Nicotinamide adenine dinucleotide (reduced form)
NF-KB	Nuclear Factor kappaB
NO	Nitric Oxide
ROS	Reactive Oxygen Species
OGTT	Oral glucose Tolerance Test
VLCKD	Very Low-Calorie Ketogenic Diet
VLCnKD	Very Low-Calorie non-Ketogenic Diet