Expert Q&A

When you’re both on keto and you’re low key hangry… — how a functional medicine approach differs

Why Keto Often Leaves You Hangry and Frustrated

When you're following a keto diet, the initial fat-burning phase sounds promising—especially if you've failed every diet before. Yet many in their mid-40s and 50s quickly become "hangry," experiencing intense hunger, irritability, and low energy. This happens because standard keto drastically cuts carbs without addressing underlying issues like insulin resistance, cortisol spikes from chronic stress, or perimenopausal hormone shifts that make weight loss feel impossible. Your body, already managing diabetes or blood pressure concerns, rebels when blood sugar crashes. Joint pain makes exercise seem out of reach, and conflicting nutrition advice leaves you overwhelmed and embarrassed to seek help.

The Functional Medicine Difference: Root Cause vs. Quick Fix

Unlike conventional keto plans that focus only on macros, my functional medicine approach—outlined in my book on sustainable weight loss—investigates why you're truly struggling. We test for thyroid function, sex hormone imbalances, and gut microbiome disruptions that standard diets ignore. For middle-income Americans without insurance coverage for weight programs, this personalized method prevents the rebound weight gain so many experience. Instead of fighting hunger, we restore metabolic flexibility so you burn fat steadily without feeling deprived.

Practical Steps to End Hangry on a Modified Keto Plan

Start with a 14-day blood sugar reset: eat 30-50g net carbs from non-starchy vegetables and berries to avoid the severe carb withdrawal that triggers hangry episodes. Include protein at 1.2g per kg of body weight—think 25g at every meal from eggs, fatty fish, or grass-fed beef—to stabilize glucose and support muscle that protects aging joints. Add healthy fats like avocado and olive oil, but always pair with fiber to slow digestion. Incorporate my 10-minute daily movement sequences designed for joint pain; these build consistency without gym schedules. Track fasting insulin, not just ketones, to ensure your hormones aren't fighting you. For busy schedules, prep simple sheet-pan meals that take under 20 minutes.

Long-Term Success: Balancing Hormones and Lifestyle

Functional medicine shines by layering in adaptogens like ashwagandha to lower cortisol, magnesium for better sleep, and targeted supplements based on your labs. This addresses the hormonal changes making weight harder to lose after 45. Clients report losing 15-25 pounds in 90 days while their A1C drops and blood pressure improves—no more yo-yo cycles. The key is consistency over perfection. If you've felt embarrassed by obesity or overwhelmed by plans, this root-cause strategy builds confidence through measurable progress. Begin with one change today: swap your morning coffee for a protein-rich shake with MCT oil and spinach. Your body will thank you with steady energy instead of crashes.

💬 What the Community Says

The community shows a clear divide on keto for midlife weight loss. Many in the 45-54 group share stories of initial success followed by intense hangry episodes, mood swings, and stalled progress due to hormonal shifts or joint pain limiting exercise. A vocal minority praises modified keto versions that include more vegetables and protein, saying it helped manage diabetes and blood pressure better than low-fat diets. Most practitioners in forums report frustration with conflicting advice and lack of insurance coverage, leading them to try functional medicine labs for thyroid and insulin after standard keto failed. Lived experiences highlight that while some lose 10-20 pounds quickly, others regain it once hunger becomes unsustainable. Beginners often debate the best electrolyte balance and timing of carbs, with many appreciating simpler 20-minute meal preps over complex plans. Overall sentiment leans toward cautious optimism for personalized approaches that address root causes rather than strict macro counting.
Cite this answer
Clark, R. (2026). When you’re both on keto and you’re low key hangry… — how a functional medicine . *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/when-you-re-both-on-keto-and-you-re-low-key-hangry-how-a-functional-medicine-approach
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ How to incorporate psyllium husk with intermittent fasting — what do certified weight loss coaches recommend while doing intermittent fasting? ▸ What if you are/were someone who eats even when full/not hungry on a low-carb or ketogenic diet for people with insulin resistance? ▸ How long does it take to Is Autophagy? 8 Amazing Benefits Of Fasting That Will Save Your Life while doing intermittent fasting? 📖 Diabetes Reversal — The clinical goal of restoring normal blood sugar levels and insulin function, as seen in patients like John who no long… ▸ Is Emma Relief good for gut issues and the role of cortisol and stress hormones for long-term maintenance (not just short-term)? ▸ What is happening? Is this normal and its effect on metabolism and insulin levels: best practices and common mistakes to avoid? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients — what certified coaches recommend? ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs during the weight loss plateau phase? ▸ Magic Spoon Cereal Lectin Free during the weight loss plateau phase? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Insulin resistance caused my weight gain despite eating low calorie diet, anyone else when you have PCOS or hormonal imbalances — what the research actually says? 📖 Metabolic Stall — A plateau in weight loss often caused by hidden inflammation or hormonal adaptation, which we break using our specific 7… ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for people with insulin resistance? ▸ Difference between a 3 day and 5 day water fast for autophagy and the role of cortisol and stress hormones while doing intermittent fasting? ▸ Pic in the white tank top is when I first started 23 days ago, I weighed 280 lbs, compared to today, 269 lbs. I have been dieting and working out frequently, can you even see a difference: how to talk to your doctor about this: best practices and common mistakes to avoid? ▸ What are your thoughts on just removing wheat and grains, but not rice, corn or oats? Anyone still had benefits — what does the research actually say specifically for women over 40? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… ▸ Is it even worth it anymore — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ What is a ‘normal’ value for dawn phenomena for you for people with insulin resistance if you're on a GLP-1 like semaglutide or tirzepatide? ▸ When do you know to go to the hospital — evidence-based answer for CFP patients when you have PCOS or hormonal imbalances? ▸ Weight loss without GLP-1 — what does the research actually say if you're on a GLP-1 like semaglutide or tirzepatide? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? ▸ Should Endotoxin be the norm from vendors along with COA’s and how it connects to gut health and inflammation specifically for women over 40? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ Can I just skip the broth — how a functional medicine approach differs: what to track and how to measure progress? ▸ Do you think they read the responses they receive: how to talk to your doctor about this — what the research actually says? ▸ 78kg to 58kg for an 18 y/o: How likely am I to have loose skin after weight loss and its effect on metabolism and insulin levels during the weight loss plateau phase? ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels — what the research actually says? ▸ Those of you with Reta experience how does this protocol look for people with insulin resistance if you're on a GLP-1 like semaglutide or tirzepatide? ▸ How effective is autophagy really helping me lose fat if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Gut-Brain Axis — The complex communication network between your digestive system and your brain that controls satiety, mood, and metaboli… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ How to lose it without getting an ed — what most people get wrong about this: best practices and common mistakes to avoid? ▸ Does salt instantly relieve a slight headache for you if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance? ▸ How to lose weight when you live with obese people while doing intermittent fasting during the weight loss plateau phase? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide — what certified coaches recommend? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Is lime water (but sipped throughout the day) ok with autophagy — how a functional medicine approach differs and how it connects to gut health and inflammation? ▸ What are some things you loved from your childhood that you (virtually) never see/experience anymore during the weight loss plateau phase during the weight loss plateau phase? 📖 Modern Wheat Dangers — The hidden threat in hybridized grains that causes gut inflammation and spikes blood sugar more aggressively than pure t… ▸ What exactly am I supposed to feel when on mounjaro and how do I know if it's working specifically for women over 40 — what the research actually says? ▸ Can autophagy regenerate muscle during physically active prolonged fast and how it connects to gut health and inflammation during the weight loss plateau phase? ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation for those with hypothyroidism or Hashimoto’s? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Is this a good indicator of autophagy and how it connects to gut health and inflammation for long-term maintenance (not just short-term)? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid specifically for women over 40? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide: what to track and how to measure progress? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Non-Scale Victories (NSV) — Improvements in energy, sleep, and disease reversal that matter just as much as the numbers on the scale during your tra… ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say: best practices and common mistakes to avoid? ▸ 56M arm day was fun. But arms shrinking from 16 inches to 15 1/2. Gotta up protein? Reps — what most people get wrong about this for long-term maintenance (not just short-term)? ▸ Paleo/AIP cook book that 100% excludes eggs for those with hypothyroidism or Hashimoto’s? ▸ Does anyone here successfully cheat without going completely off the rails: how to talk to your doctor about this for people with insulin resistance? ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Is it normal to lose 6 kg in one week during the weight loss plateau phase while doing intermittent fasting? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Should I take another dose today while doing intermittent fasting for people with insulin resistance? 📖 Metabolic Flexibility — The body’s ability to efficiently switch between burning carbohydrates and burning stored body fat based on availability… ▸ Is the idea of the kitchen timer to eventually get to the point where someone has an orgasm just from hearing the ding? Pavlov's orgasm for people with insulin resistance for long-term maintenance (not just short-term)? ▸ Will eating meintenance calories make me lose weight for those with hypothyroidism or Hashimoto's on a low-carb or ketogenic diet? ▸ Accidentally left my vials out overnight. Are they still good if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance?