Still tired even though you’re doing everything right? Here’s what to check next.
You’re sleeping more.
You’re eating well.
You’ve cut back on alcohol.
You’re exercising, but not overdoing it.
You have tried magnesium, electrolytes, protein, morning sunlight, less coffee, more coffee, earlier nights and “just pushing through”.
And yet, you still feel exhausted.
This is one of the most common patterns we see in clinic: people who are not ignoring their health, but still don’t feel like they’re running at 100%…or even 80%. They’re often doing many of the “right” things, but they still wake up tired, crash in the afternoon, feel foggy, lose motivation or feel like they are constantly running on low battery.
Fatigue is not always a discipline problem. Sometimes it’s a sign that your body needs a more detailed review of the bigger picture.
This doesn’t mean you need every test available. It means the right test depends on the question you are trying to answer.
First: fatigue should be reviewed properly
Ongoing fatigue is worth discussing with your GP, especially if it is new, worsening, severe, unusual for you or affecting your ability to function. They can run some bloods (see below for the recommendations).
A good starting point is usually to review the basics first, then decide whether more personalised functional testing may add another layer of information.
Yellow flags: signs your fatigue may need more investigation
These are not necessarily emergency signs, but they are clues that it may be worth looking more closely rather than just pushing through.
You may want to investigate further if:
You are getting enough sleep but still waking up unrefreshed- or your sleep tracking says you’re getting very low restful sleep (under 70% is not optimal).
You need caffeine to feel remotely functional.
You crash in the afternoon, especially after meals.
You feel wired but tired at night.
Your exercise tolerance has dropped.
You feel foggy, flat or mentally slower than usual.
You are more reactive, emotional or stress-sensitive than normal.
You are losing motivation even though you want to feel better.
You feel dizzy, lightheaded or weak.
You experience heavy limbs, poor recovery or low stamina.
You have heavy periods, irregular cycles or new cycle changes.
You feel cold, sluggish, constipated or notice hair shedding.
You have bloating, constipation, loose stools, reflux or food reactions alongside fatigue.
You are getting sick more often or recovering slowly.
You have had blood work done, but only a very basic panel was checked.
You have been told your results are “normal”, but no one has explained whether your markers match how you actually feel.
The important question is not just, “Are my results in range?”
A better question is:
Do my symptoms, history, lifestyle, stress load and markers make sense together?
What to ask your GP to check first
Your GP is the right place to start with ongoing fatigue, especially if it is new, worsening, severe or unusual for you. The exact tests you need will depend on your symptoms, history and risk factors, but these are common markers worth discussing that will give us a really deep dive into all the possible drivers.
Full blood count — screens for anaemia, infection patterns and red/white blood cell changes.
Iron studies — checks iron stores, oxygen transport, dizziness, heavy limbs and exercise tolerance.
Vitamin B12 — supports red blood cells, nervous system function, methylation and brain fog.
Folate — supports red blood cell production and methylation-related pathways.
Vitamin B6 — supports red blood cell production and methylation-related pathways. If you see this is super high on your test, it doesn’t always mean you’re taking too much…sometimes it can mean a nutritional deficiency that stops B6 absorption into the cell (meaning lots is floating around in the blood unused!)
Thyroid function: TSH, free T4, free T3 — reviews thyroid patterns linked with fatigue, coldness, constipation, hair shedding and low mood.
Thyroid antibodies: TPOAb and TgAb — may be useful when thyroid symptoms or family history are present.
Vitamin D — worth reviewing with low sun exposure, known deficiency risk, low mood, immune changes or bone health concerns.
Fasting glucose and HbA1c — gives insight into blood sugar regulation and energy crashes.
Fasting Insulin — may help assess insulin resistance patterns when cravings, crashes or metabolic symptoms are present.
Liver function tests — reviews liver markers and broader metabolic health.
Kidney function and electrolytes — checks kidney markers, hydration and mineral balance.
CRP and ESR — general inflammation markers that may guide whether further investigation is needed.
Coeliac screening — worth discussing if fatigue comes with bloating, constipation, low iron or nutrient deficiencies.
Sex hormones, where relevant — may be useful with irregular cycles, heavy bleeding, PMS changes, low libido, hot flushes, night sweats or perimenopause-type symptoms.
What if your GP testing is normal, but you still feel tired?
This is where many people get stuck.
Standard blood work can be very useful, but it may not answer every question. Sometimes the issue is not that the testing was wrong. It may be that the testing only looked at one layer of the picture.
For example:
Your haemoglobin may be in range, but your iron stores may need review or your transferrin is incredibly low.
Your TSH may be in range, but your symptoms may suggest a broader thyroid discussion is needed.
Your B12 may technically be in range, but still worth interpreting alongside symptoms, diet and other markers. There may genetic variants where B12 transport isn’t working successfully.
Your glucose may look normal, but your energy crashes may still point to a blood sugar regulation conversation. Maybe fasting insulin is higher, leading us to question whether it’s heading towards an insulin resistant picture.
Your bloodwork may not tell you much about gut microbial patterns, methylation-related genes or cortisol rhythm.
This is why interpretation matters.
A result is not just a number. It needs to be reviewed alongside your symptoms, health history, diet, stress load, sleep, cycle history, bowel habits, medications, supplements and goals.
Functional testing that may be worth considering for ongoing fatigue
Functional testing is not needed for everyone. It also does not diagnose disease or replace medical care.
HOWEVER when chosen carefully, functional testing can provide another layer of factual-based personalised information that may help guide a more tailored nutrition and lifestyle conversation.
For ongoing fatigue, the most relevant functional testing areas often include:
Genetic methylation testing
Gut microbiome testing
Stress hormone and cortisol rhythm testing
Broader multi-system testing, where several patterns need to be reviewed together
The right option depends on what you are trying to understand.
Genetic methylation testing and fatigue
The Genetic Methylation Test may be useful when you want to understand selected genetic tendencies related to methylation, nutrient metabolism and related biochemical pathways.
Methylation is involved in how the body uses certain nutrients and supports related processes. It is not the whole fatigue picture, but it can provide useful context for some people, especially when fatigue sits alongside brain fog, mood changes, stress sensitivity or supplement confusion.
A genetic methylation test may help explore selected genes involved in areas such as:
Folate and B12-related pathways
Methylation-related nutrient processing
Homocysteine-related pathways
Detoxification-related pathways
Mood-related pathways
Energy and resilience-related pathways
Inflammation-related tendencies
Hormone-related pathways
Broader nutrient metabolism patterns
This may be relevant if:
You have fatigue, brain fog, mood changes or stress sensitivity.
You have chronically low motivation or anxiety, depression or insomnia
You have heard about MTHFR but want more than one gene checked.
You want to understand genetic tendencies that may influence nutrient needs for the rest of your life.
You want a personalised nutrition plan that considers your genetic profile.
You want to understand what exercise suits your body best from a genetic standpoint.
Explore the Genetic Methylation Test here:
Genetic Methylation Test
Gut microbiome testing and fatigue
Gut health and fatigue can overlap, especially when fatigue appears alongside bloating, constipation, loose stools, reflux, food reactions, histamine-type symptoms or a long history of restrictive eating.
The gut microbiome is one part of the broader health picture. It is not the answer to everything, but it can provide useful context when gut symptoms are part of the fatigue pattern.
A gut microbiome test may help explore:
Gut bacterial species
Microbial diversity
Gut ecosystem patterns
Functional potential of the microbiome
Digestive marker patterns
Microbial patterns that may be relevant to broader nutrition support
This may be relevant if:
You are tired and bloated.
You react to many foods and can’t really put your finger on whats going on.
You have constipation, loose stools or alternating bowel patterns.
You have tried probiotics but don’t know whether they are right for you, or they sometimes make you feel worse.
You have been told it is “just IBS”, but no one has helped you understand the gut pattern properly.
You want more than a generic gut protocol or to be put on a million supplements without anyone actually looking at what’s going on.
Explore the Gut Microbiome Test here:
Gut Microbiome Test
Stress hormone testing and fatigue
When people say they are “burnt out”, “wired but tired” or “running on stress”, what they are often describing is a pattern in energy, sleep, recovery and stress tolerance.
Stress hormone testing can provide context around cortisol rhythm and, depending on the test, selected hormone patterns.
This is not about blaming stress for everything. It is about understanding whether your daily rhythm matches how you feel.
Stress hormone testing may help explore:
Cortisol rhythm across the day
Morning cortisol patterns
Afternoon or evening cortisol patterns
Stress rhythm context
Selected sex hormone patterns, depending on the test
Hormone metabolites, depending on the test selected
This may be relevant if:
You wake up tired but feel more alert at night.
You feel wired but exhausted.
You crash in the afternoon.
You rely on caffeine to function.
Your sleep is not refreshing.
You feel more stress-sensitive than usual.
Your recovery has dropped.
Your fatigue comes with cycle changes, mood changes or sleep changes.
Relevant Wellbeing George Nutrition options include:
Well Woman Test
Well Man Test
DUTCH Complete Hormone Test
Methylation & Mood Package
The Longevity Deep-Dive Package: when you want multiple systems reviewed together
If fatigue is not sitting neatly in one category, a more comprehensive pathway may make more sense than ordering one isolated test.
The Longevity Deep-Dive Package brings together multiple layers of information, including genetic methylation testing, microbiome testing, stress hormone testing, bloodwork interpretation and a 90-minute consultation.
This may be suitable for people who want a broader review across:
Genetic tendencies
Methylation and nutrient pathway context
Gut microbiome patterns
Stress hormone rhythm
Existing bloodwork
Nutrition and lifestyle patterns
Healthy ageing and longevity context
A more complete picture rather than one report in isolation
This package may be relevant if:
You are doing many things “right” but still feel tired.
You have multiple overlapping symptoms.
You want genetics, gut, stress rhythm and bloodwork reviewed together.
You are a busy professional, parent, founder or high-responsibility person who wants a clearer plan.
You are interested in healthy ageing, prevention and long-term wellbeing.
You don’t want to keep guessing what to eat, what exercise suits you best, what you should and shouldn’t include in your daily life routine and what supplements suit you best.
Explore the Longevity Deep-Dive Package here:
Longevity Deep-Dive Package
Other testing that may be relevant
Depending on your fatigue pattern, these may also be worth considering.
Complete Nutritional Blueprint
The Complete Nutritional Blueprint is a broader blood and urine testing option that may provide current-state information across nutrient, metabolic and functional markers. It may be useful if you want to understand what is happening biochemically now, rather than only looking at genetic tendencies.
Explore the Complete Nutritional Blueprint here:
Complete Nutritional Blueprint
Organic Acids Test
The Organic Acids Test is a urine-based test that may provide context around selected metabolic patterns, nutrient demand, energy production, oxidative stress and gut-derived metabolites.
Explore the Organic Acids Test here:
Organic Acids Test
The key is not more testing. It is the right testing.
If you are exhausted, it can be tempting to order every test and hope one of them gives you the answer.
But more testing is not always better.
The better starting point is to ask:
What am I trying to understand?
Are my symptoms pointing more toward nutrient status, thyroid, blood sugar, sleep, gut, hormones, stress rhythm, methylation or something else?
Do I need current bloodwork reviewed before ordering functional testing?
Do I want a single test, or do I need multiple systems interpreted together?
Do I feel confident interpreting a report alone, or do I need practitioner support?
A report is useful. Interpretation is what makes it practical and actionable.
How Wellbeing George Nutrition can help
At Wellbeing George Nutrition, we help people understand their health picture through practitioner-guided functional testing, bloodwork review and personalised nutrition support.
Fatigue is rarely just one thing. It often needs a careful review of your symptoms, markers, health history, diet, stress load, sleep, gut patterns, cycle history, medications, supplements and goals.
The aim is not to label you, overwhelm you or send you for unnecessary testing.
The aim is to help you understand what your body may be showing you, and what the next practical step could be.
Helpful next steps:
Explore the Longevity Deep-Dive Package
Explore the Genetic Methylation Test
Explore the Gut Microbiome Test
Explore the DUTCH Complete Hormone Test
Explore all testing options
Final note
This article is general education only. It does not replace medical advice, diagnosis or treatment. If your fatigue is new, severe, worsening, persistent or worrying you, please speak with your GP or another appropriate healthcare provider.
Functional testing can provide useful information when it is chosen for the right question and interpreted in context. It is one part of the picture, not the whole answer.