Lecture 6 Flashcards
What is a fad diet?
Popular diet for short time without a standard dietary recommendation
Often unreasonable claims for fast weight loss or health improvements
What are some issues about fad diets?
Restrictive diet
Unrealistic goals
Costly
What is a ketogenic diet?
High fat, low carb diet
Promote burning ketones, rather than glucose for energy
What is the approximate meal composition for a keto diet?
75% fat
20% protein
5% carbs
What are ketones?
Alternative energy source when glucose is in short supply
Where are ketones made?
Liver from breakdown of fats
When we have a low carb diet, what do cells do to adapt?
Switch to ketosis
Usually happens over 2-4 days of eating 20-50g carbs per day
What are the hormone levels like during ketosis?
Low insulin levels
Normal glucagon
Normal epinephrine
These cause fat to be released from adipose tissue
How does fat travel to get converted into energy?
Travel through blood to liver to get converted into ketones, then the ketones travel to get picked up by cells and converted into acetyl-Co-A and enter the Krebs cycle
What is the function of insulin in relation to ketones?
Stops the body from having excess ketone production which can cause ketoacidosis
How does a keto diet reduce seizures?
Increase GABA
Reduced neuronal excitability and firing
Stabilized synaptic function
Due to ketoacidosis state
Who especially benefits from a keto diet for weight loss?
Type 2 diabetics
Lose 1-2 lbs a week
What are risks of a ketogenic diet?
Keto flu (brain fog)
High in saturated fats (increase LDL, which increase CVD)
Nutrient deficiency (Selenium, mg, ca, vit b and c)
Liver problems (fat metabolism)
Kidney problems (increase protein metabolism, kidney stones)
Constipation (low fiber)
Fuzzy thinking and mood swings (low carbs)
Not sustainable weight loss
What is a Paleolithic diet?
High fat, low carb but based on Paleolithic(Stone Age) diet
What is meal composition of a Paleolithic diet?
40% fat, 30% protein,30% carbs