Do you guarantee specific results?

No medical provider can guarantee specific results. We can guarantee a thorough plan, evidence-based tools, and close follow-up. Most patients see meaningful improvements in energy, body composition, and metabolic markers within 3 to 6 months when they follow the plan consistently.

Are GLP-1 medications safe long-term?

GLP-1 medications appear safe long-term based on a decade-plus of diabetes use and cardiovascular outcome trials in non-diabetic patients. Common side effects include nausea, constipation, and reflux, particularly in the first weeks. Rare but serious risks include pancreatitis and gallbladder issues. We monitor closely.

Do I have to take GLP-1 medications forever?

You do not necessarily have to take GLP-1 medications forever. About 30% to 50% of weight is regained within a year of stopping if no maintenance plan is in place. That is why we focus on building durable habits and muscle while you are on the medication, often allowing a low maintenance dose or full discontinuation.

Can I improve metabolic efficiency without medication?

Yes, you can improve metabolic efficiency without medication. Resistance training, fiber, sleep, protein, stress management, and Zone 2 cardio can produce meaningful gains. Many patients fix early metabolic dysfunction with these alone. Medications are tools we add when biology is too entrenched for lifestyle alone.

What is metabolic flexibility?

Metabolic flexibility is your bodys ability to switch between burning glucose and burning fat depending on what is available. A flexible system handles a heavy meal and a missed meal equally well. A stuck system feels foggy or shaky if a meal is delayed. Building it requires Zone 2 cardio, resistance training, and good food timing.

How does muscle mass affect metabolism?

Muscle mass directly affects metabolism by acting as a glucose disposal site. Skeletal muscle is the largest tissue clearing sugar from the bloodstream. More muscle means each meal raises blood sugar less, insulin needs are lower, and resting metabolic rate is higher. Resistance training is one of the most powerful insulin-sensitizing tools.

Is this approach covered by insurance?

Some parts are covered by insurance, others are not. Standard labs are usually covered. GLP-1 coverage varies by plan and starting BMI. DEXA scans and continuous glucose monitors are sometimes covered for specific indications. We are transparent about costs and help with prior authorizations when possible.

How fast can I expect results?

Most patients notice small improvements (better sleep, steadier energy) within 2 to 4 weeks. Visible body composition changes usually take 8 to 12 weeks. Lab markers like fasting insulin and A1c (a 3-month blood sugar average) usually improve within 3 to 6 months. Big changes in VO2 max take 3 to 6 months of consistent training.

What is "Ozempic face" and how do you prevent it?

"Ozempic face" describes the gaunt look that some people get during rapid weight loss on GLP-1 medications. Facial fat is lost along with body fat. Prevention focuses on slower loss, adequate protein, resistance training, and good hydration. Some patients address lost facial volume cosmetically once weight is stable.

How does sleep affect metabolic health?

Sleep is foundational to metabolic health. Even one night of bad sleep can raise next-day insulin resistance by about 30%. Chronic poor sleep raises hunger hormones, lowers fullness hormones, and increases visceral fat. Most patients who fix sleep see meaningful metabolic improvements without changing food.

What is "TOFI" (thin outside, fat inside)?

TOFI stands for "thin outside, fat inside." It describes patients who look slender but have significant visceral fat (deep belly fat around organs). They often have insulin resistance, high triglycerides, and fatty liver despite a normal BMI. Only DEXA scans reliably reveal this pattern. Many South Asian and East Asian patients fit this picture.

Why is visceral fat more dangerous than subcutaneous fat?

Visceral fat (around organs) is metabolically active. It releases inflammatory signals and free fatty acids directly into the liver. This drives insulin resistance, fatty liver, and heart disease. Subcutaneous fat (just under the skin) is far less inflammatory. DEXA scans tell us how much of each you have.

How does insulin resistance prevent weight loss?

Insulin resistance prevents weight loss by keeping insulin levels high. High insulin tells fat cells to keep storing fat and blocks fat from being released for fuel. Even with a small calorie deficit, weight loss can stall when insulin stays elevated. Lowering carb load, building muscle, and using insulin sensitizers like metformin help break this cycle.

What is leptin resistance?

Leptin resistance is when the brain stops responding to leptin, the hormone that signals fullness. The brain "thinks" you are starving even when you have plenty of fat stored. This is one reason chronic dieting fails. GLP-1 medications and improved insulin sensitivity can help reset the signal over time.

How do GLP-1 medications affect muscle mass?

GLP-1 medications can cause meaningful muscle loss (20% to 40% of weight lost) without specific intervention. With high protein intake (around 1 gram per pound of ideal body weight), resistance training 2 to 3 times per week, and creatine supplementation, muscle loss can drop substantially. We track grip strength and DEXA scans to catch problems early.

What is the role of the gut microbiome in metabolism?

The gut microbiome shapes calorie extraction, hunger signals, and inflammation. Patients with low microbial diversity often have more insulin resistance and more weight gain. Fiber-rich whole-food eating, fermented foods, and treating dysbiosis (an unhealthy mix of gut bacteria) can support metabolic recovery.

How does perimenopause change metabolism?

Perimenopause changes metabolism through declining estrogen, which moves fat storage to the belly, lowers insulin sensitivity, and reduces muscle protein synthesis. Many women gain 5 to 10 pounds and develop new metabolic issues during this transition. Strength training, careful protein intake, and sometimes hormone therapy help.

What is "set point theory" in weight regulation?

Set point theory says the brain defends a specific body weight by adjusting metabolism and appetite. When you lose weight, hunger rises and metabolism slows to bring you back. GLP-1 medications appear to lower the defended set point in many patients, which is why long-term weight loss is more achievable with them than with diet alone.

How does Zone 2 cardio improve metabolism?

Zone 2 cardio (heart rate around 60% to 70% of max, where you can hold a conversation) builds mitochondrial density and capacity. Mitochondria (the energy-producing parts of cells) are the engines of metabolic flexibility. Studies show 3 to 4 hours per week of Zone 2 produces real cardiometabolic gains over months.

What is metformins role in metabolic care?

Metformin is an inexpensive medication that improves insulin sensitivity and lowers liver glucose production. It has been used for decades for type 2 diabetes and PCOS (polycystic ovary syndrome). Some clinicians use it earlier in metabolic dysfunction or for longevity. It activates AMPK (a cellular energy sensor) and inhibits mTOR (a growth-aging pathway).

Can you reverse fatty liver disease?

Yes, you can reverse early fatty liver disease, now called metabolic dysfunction-associated steatotic liver disease (MASLD). Weight loss of 7% to 10%, reduced alcohol, lower refined carbs, and resistance training can clear most fatty liver within 6 to 12 months. Advanced fibrosis is harder to reverse, which is why early diagnosis matters.

How does ApoB compare to LDL cholesterol?

ApoB measures the number of cholesterol-carrying particles in your blood, while LDL measures the cholesterol mass. Two patients can have the same LDL with very different particle counts. ApoB is a stronger predictor of heart disease, particularly in patients with metabolic dysfunction where particles tend to be small and dense.

What about microdosing GLP-1s?

Microdosing GLP-1 medications means using doses below the FDA-approved range. Some clinicians use it for metabolic health and possible longevity benefits in patients who do not need significant weight loss. Long-term safety and benefit data are still emerging. We use it selectively, not as a default.

How does chronic stress prevent weight loss?

Chronic stress prevents weight loss by keeping cortisol elevated. High cortisol drives insulin resistance, increases visceral fat, raises hunger, and disrupts sleep. Patients who fix stress through breathwork, sleep hygiene, walking, and limited caffeine often see weight start moving after months of stalling.

What is the connection between insulin resistance and Alzheimer's?

Some researchers call Alzheimer's "type 3 diabetes" because insulin resistance in the brain may drive plaque formation and neuronal damage. Patients with type 2 diabetes have roughly double the risk of Alzheimer's. Lowering insulin resistance through lifestyle and sometimes medication may slow cognitive decline, though long-term trial data is still developing.

How does alcohol affect metabolic health?

Alcohol affects metabolic health by adding empty calories, raising triglycerides, driving fatty liver, disrupting sleep, and lowering insulin sensitivity. Even moderate drinking (5 to 7 drinks per week) shows up in metabolic labs. Patients optimizing metabolism usually benefit from cutting back, particularly during the first 6 months.

Can intermittent fasting fix insulin resistance?

Intermittent fasting can improve insulin resistance, particularly when combined with resistance training and adequate protein. Time-restricted eating (12 to 8 PM, for example) lowers fasting insulin in many studies. Longer fasts may work too but need careful planning to protect muscle.

What is the role of vitamin D in metabolic health?

Vitamin D plays a role in insulin sensitivity, immune function, and inflammation. Low levels are linked to higher metabolic dysfunction, though whether supplementation alone reverses these effects is less clear. We test 25-hydroxy vitamin D and target levels around 50 to 70 ng/mL in most adults, particularly through Philly winters.

What are advanced glycation end-products (AGEs)?

Advanced glycation end-products (AGEs) are damaged proteins formed when sugar binds to proteins in the body. They build up with high blood sugar and contribute to wrinkles, stiff arteries, and cataracts. They form in food too, particularly through high-heat cooking like grilling and frying. Lower-heat cooking and good blood sugar control reduce AGE accumulation.

Do you guarantee specific results?

No medical provider can guarantee specific results. We can guarantee a thorough plan, evidence-based tools, and close follow-up. Most patients see meaningful improvements in energy, body composition, and metabolic markers within 3 to 6 months when they follow the plan consistently.

Are GLP-1 medications safe long-term?

GLP-1 medications appear safe long-term based on a decade-plus of diabetes use and cardiovascular outcome trials in non-diabetic patients. Common side effects include nausea, constipation, and reflux, particularly in the first weeks. Rare but serious risks include pancreatitis and gallbladder issues. We monitor closely.

Do I have to take GLP-1 medications forever?

You do not necessarily have to take GLP-1 medications forever. About 30% to 50% of weight is regained within a year of stopping if no maintenance plan is in place. That is why we focus on building durable habits and muscle while you are on the medication, often allowing a low maintenance dose or full discontinuation.

Can I improve metabolic efficiency without medication?

Yes, you can improve metabolic efficiency without medication. Resistance training, fiber, sleep, protein, stress management, and Zone 2 cardio can produce meaningful gains. Many patients fix early metabolic dysfunction with these alone. Medications are tools we add when biology is too entrenched for lifestyle alone.

What is metabolic flexibility?

Metabolic flexibility is your bodys ability to switch between burning glucose and burning fat depending on what is available. A flexible system handles a heavy meal and a missed meal equally well. A stuck system feels foggy or shaky if a meal is delayed. Building it requires Zone 2 cardio, resistance training, and good food timing.

How does muscle mass affect metabolism?

Muscle mass directly affects metabolism by acting as a glucose disposal site. Skeletal muscle is the largest tissue clearing sugar from the bloodstream. More muscle means each meal raises blood sugar less, insulin needs are lower, and resting metabolic rate is higher. Resistance training is one of the most powerful insulin-sensitizing tools.

Is this approach covered by insurance?

Some parts are covered by insurance, others are not. Standard labs are usually covered. GLP-1 coverage varies by plan and starting BMI. DEXA scans and continuous glucose monitors are sometimes covered for specific indications. We are transparent about costs and help with prior authorizations when possible.

How fast can I expect results?

Most patients notice small improvements (better sleep, steadier energy) within 2 to 4 weeks. Visible body composition changes usually take 8 to 12 weeks. Lab markers like fasting insulin and A1c (a 3-month blood sugar average) usually improve within 3 to 6 months. Big changes in VO2 max take 3 to 6 months of consistent training.

What is "Ozempic face" and how do you prevent it?

"Ozempic face" describes the gaunt look that some people get during rapid weight loss on GLP-1 medications. Facial fat is lost along with body fat. Prevention focuses on slower loss, adequate protein, resistance training, and good hydration. Some patients address lost facial volume cosmetically once weight is stable.

How does sleep affect metabolic health?

Sleep is foundational to metabolic health. Even one night of bad sleep can raise next-day insulin resistance by about 30%. Chronic poor sleep raises hunger hormones, lowers fullness hormones, and increases visceral fat. Most patients who fix sleep see meaningful metabolic improvements without changing food.

What is "TOFI" (thin outside, fat inside)?

TOFI stands for "thin outside, fat inside." It describes patients who look slender but have significant visceral fat (deep belly fat around organs). They often have insulin resistance, high triglycerides, and fatty liver despite a normal BMI. Only DEXA scans reliably reveal this pattern. Many South Asian and East Asian patients fit this picture.

Why is visceral fat more dangerous than subcutaneous fat?

Visceral fat (around organs) is metabolically active. It releases inflammatory signals and free fatty acids directly into the liver. This drives insulin resistance, fatty liver, and heart disease. Subcutaneous fat (just under the skin) is far less inflammatory. DEXA scans tell us how much of each you have.

How does insulin resistance prevent weight loss?

Insulin resistance prevents weight loss by keeping insulin levels high. High insulin tells fat cells to keep storing fat and blocks fat from being released for fuel. Even with a small calorie deficit, weight loss can stall when insulin stays elevated. Lowering carb load, building muscle, and using insulin sensitizers like metformin help break this cycle.

What is leptin resistance?

Leptin resistance is when the brain stops responding to leptin, the hormone that signals fullness. The brain "thinks" you are starving even when you have plenty of fat stored. This is one reason chronic dieting fails. GLP-1 medications and improved insulin sensitivity can help reset the signal over time.

How do GLP-1 medications affect muscle mass?

GLP-1 medications can cause meaningful muscle loss (20% to 40% of weight lost) without specific intervention. With high protein intake (around 1 gram per pound of ideal body weight), resistance training 2 to 3 times per week, and creatine supplementation, muscle loss can drop substantially. We track grip strength and DEXA scans to catch problems early.

What is the role of the gut microbiome in metabolism?

The gut microbiome shapes calorie extraction, hunger signals, and inflammation. Patients with low microbial diversity often have more insulin resistance and more weight gain. Fiber-rich whole-food eating, fermented foods, and treating dysbiosis (an unhealthy mix of gut bacteria) can support metabolic recovery.

How does perimenopause change metabolism?

Perimenopause changes metabolism through declining estrogen, which moves fat storage to the belly, lowers insulin sensitivity, and reduces muscle protein synthesis. Many women gain 5 to 10 pounds and develop new metabolic issues during this transition. Strength training, careful protein intake, and sometimes hormone therapy help.

What is "set point theory" in weight regulation?

Set point theory says the brain defends a specific body weight by adjusting metabolism and appetite. When you lose weight, hunger rises and metabolism slows to bring you back. GLP-1 medications appear to lower the defended set point in many patients, which is why long-term weight loss is more achievable with them than with diet alone.

How does Zone 2 cardio improve metabolism?

Zone 2 cardio (heart rate around 60% to 70% of max, where you can hold a conversation) builds mitochondrial density and capacity. Mitochondria (the energy-producing parts of cells) are the engines of metabolic flexibility. Studies show 3 to 4 hours per week of Zone 2 produces real cardiometabolic gains over months.

What is metformins role in metabolic care?

Metformin is an inexpensive medication that improves insulin sensitivity and lowers liver glucose production. It has been used for decades for type 2 diabetes and PCOS (polycystic ovary syndrome). Some clinicians use it earlier in metabolic dysfunction or for longevity. It activates AMPK (a cellular energy sensor) and inhibits mTOR (a growth-aging pathway).

Can you reverse fatty liver disease?

Yes, you can reverse early fatty liver disease, now called metabolic dysfunction-associated steatotic liver disease (MASLD). Weight loss of 7% to 10%, reduced alcohol, lower refined carbs, and resistance training can clear most fatty liver within 6 to 12 months. Advanced fibrosis is harder to reverse, which is why early diagnosis matters.

How does ApoB compare to LDL cholesterol?

ApoB measures the number of cholesterol-carrying particles in your blood, while LDL measures the cholesterol mass. Two patients can have the same LDL with very different particle counts. ApoB is a stronger predictor of heart disease, particularly in patients with metabolic dysfunction where particles tend to be small and dense.

Metabolic Efficiency & Body Composition | Philadelphia

TL;DR30-second take

Metabolic efficiency is how well your body switches between burning glucose and burning fat for fuel. We measure it through fasting insulin, body composition scans, continuous glucose monitors, and VO2 max testing. The goal is a lean, muscular, low-inflammation body that runs steadily through the day, not a smaller body on the scale.

What Is Metabolic Efficiency?

Metabolic efficiency is how well your body uses the fuel you give it. An efficient system burns the right fuel at the right time: glucose during exercise, fat at rest and during sleep. An inefficient system spikes and crashes through the day and stores extra calories as visceral fat (the dangerous deep belly fat around organs).

The old "calories in, calories out" advice misses the point. Hormones (insulin, leptin, ghrelin) defend a "set point" weight that the brain treats as normal. Most diets fail because the body fights to bring you back, not because of weak willpower.

At Fishtown Medicine, we focus on body recomposition: optimizing your metabolic markers and building muscle while lowering visceral fat.

How Do We Approach Metabolic Optimization?

We use clinical principles built around how you function, not how you look. The plan has three layers.

1. Metabolic and Hormonal Audit

Before talking about treatment, we fix the foundation. We check:

Insulin resistance (a state where cells stop responding well to insulin)
Thyroid function (slow thyroid blocks metabolic progress)
Cortisol (the stress hormone, often elevated in driven professionals)
Sex hormones (low testosterone in men, PCOS markers in women)
Sleep and recovery quality

We treat what we find before adding stronger tools.

2. GLP-1 Medications and Metabolic Peptides

GLP-1 medications (a class that mimics a gut hormone called GLP-1, including Wegovy, Ozempic, and Zepbound) are powerful tools that quiet "food noise," slow stomach emptying, and reset signaling.¹ ² We prescribe them carefully, with a plan to maintain protein and resistance training so the reset does not cost you muscle.

3. Muscle Is the Organ of Longevity

Rapid metabolic changes can cost muscle if not managed correctly. We require resistance training 2 to 3 times per week and high protein intake (around 1 gram per pound of ideal body weight). We monitor body composition through DEXA scans (a low-dose X-ray that measures fat, muscle, and bone) to make sure you are building a resilient engine.³

Performance Medicine

Stop guessing at recovery and energy. Get the data behind your performance.

Book Your Performance Review

What Tests Do We Run?

Standard labs miss most of the action. Our intake includes:

Test	What It Tells Us
Fasting insulin	Insulin resistance often shows up here years before A1c rises
HOMA-IR	A calculated score of insulin sensitivity
Full thyroid panel	TSH, free T3, free T4, antibodies (most labs only check TSH)
ApoB and lipid panel	ApoB measures the number of atherogenic particles, a stronger predictor than LDL
DEXA scan	Body composition: visceral fat, lean mass, bone
VO2 max	Cardiovascular fitness, one of the strongest mortality predictors
Continuous glucose monitor	Two weeks of real-world glucose patterns

Guidance from the Clinic

"Most patients have been told to push harder. They have been pushing for years. The real fix is rarely more effort. It is finding the broken signal and repairing it."

A common question I hear: "Will I have to be on this medication forever?"

My honest answer: it depends. For some patients, GLP-1 medications are like blood pressure medications, long-term tools.⁴ ⁵ For others, the medication is a reset that helps establish new patterns, and we can taper once those are stable. We plan the off-ramp from day one.

Scientific References

Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. N Engl J Med. 2021;384(11):989-1002.
Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity. N Engl J Med. 2022;387(3):205-216.
DeFronzo RA, Tripathy D. Skeletal muscle insulin resistance is the primary defect in type 2 diabetes. Diabetes Care. 2009;32(Suppl 2):S157-S163.
Lincoff AM, et al. Semaglutide and Cardiovascular Outcomes in Obesity Without Diabetes. N Engl J Med. 2023;389(24):2221-2232. The SELECT trial.
Ryan DH, et al. Long-term weight loss effects of semaglutide in obesity without diabetes in the SELECT trial. Nat Med. 2024.

VO2 Max: the longevity vital sign - the strongest single predictor of all-cause mortality
Zone 2 Training - the metabolic foundation for endurance and longevity
Grip Strength - the easiest-to-measure marker of healthy aging
Creatine for the Brain - the cognitive and muscular case for creatine
Gut Health for Performance - the gut-performance axis that most athletes underweight

Fishtown Medicine | Performance

2418 E York St, Philadelphia, PA 19125(267) 360-7927 hello@fishtownmedicine.comHSA/FSA Eligible

Frequently Asked Questions

Common Questions

Deep-Dive Questions

Ready when you are

Start your intake

Dr. Ash reads every intake himself, and answers questions personally - usually within a few hours.

TL;DR30-second take

What Is Metabolic Efficiency?

At Fishtown Medicine, we focus on body recomposition: optimizing your metabolic markers and building muscle while lowering visceral fat.