Do you ever feel exhausted for “no reason,” crave sugar at 3pm, struggle with PMS, or deal with brain fog that makes you forget why you walked into a room…
“Um, what did I come in here for???”
These are all signs that your B vitamins may be low.
Think of B vitamins as your body’s behind-the-scenes energy crew. They help you turn food into fuel, keep your brain sharp, support your heart, balance hormones, and stabilize blood sugar. When they’re low, things can feel off in ways that are frustrating—and often confusing.
Instead of looking at each B vitamin individually, let’s talk about how they show up in real life… through the symptoms you actually feel.
Struggling with Low Energy?
If you’re tired all the time—even after eating—you may not be converting food into usable energy efficiently.
B vitamins like B1, B2, B3, and B5 are directly involved in breaking down carbohydrates, fats, and proteins and turning them into ATP (your body’s form of usable energy). Without enough of these nutrients, it’s like putting gas in your car but never turning the engine on.
Being low in these nutrients can show up as having constant fatigue, feeling tired and sluggish after meals, or needing a mid-afternoon boost of caffeine or sugar to get through the day because when your body can’t properly convert food to energy, it often looks for a quick fix like caffeine or sugar. Being low in these nutrients can also make it difficult to sustain enough energy to exercise and participate in daily physical activities.
B-Vitamin Foods for Energy Include:
- Pork (especially pork chops)
- Grass-fed beef & beef liver (extremely concentrated)
- Pasture-raised eggs (especially the yolks)
- Chicken & turkey
- Tuna & wild caught salmon
- Avocados, mushrooms
- Sweet potatoes
- Sunflower Seeds, macadamia nuts
Dealing with Brain Fog or Mood Swings?
If your brain feels foggy, your mood is unpredictable, or you’re dealing with anxiety or low motivation, your neurotransmitters may need support.
B vitamins—especially B6, B12, and folate—are essential for producing brain chemicals like serotonin and dopamine. These regulate mood, focus, memory, and emotional stability.
Without enough B vitamins, your brain may struggle to communicate effectively. This can lead to brain fog, forgetfulness and irritability. It can also show up as anxiety and depression.
And here’s the kicker—low serotonin can drive cravings for carbs and sugar because your body is trying to “self-medicate” for a quick mood boost.
B-Vitamin Foods for Brain Health Include:
- Beef liver
- Grass-fed beef, lamb and venison
- Wild-caught salmon, sardines
- Clams, oysters & mussels
- Romaine lettuce, spinach, kale & other leafy greens
- Asparagus, Brussels sprouts, broccoli & avocado
- Bananas & sweet potatoes
Concerned About Heart Health?
Heart health isn’t just about cholesterol—it’s also about something called homocysteine, an amino acid that can damage blood vessels when elevated.
B vitamins—particularly B6, B12, and folate—work together to keep homocysteine levels in a healthy range. When these vitamins are low, homocysteine can rise, increasing cardiovascular risk.
B vitamins also support red blood cell production and circulation, ensuring oxygen is delivered efficiently throughout your body. A deficiency in B6, B12 and folate can present fatigue, shortness of breath, poor circulation and increased cardiovascular risk markers.
B-Vitamin Food Sources for Heart Health Include:
- Beef liver
- Grass-fed beef, lamb and venison
- Wild-caught salmon, sardines
- Clams, oysters & mussels
- Romaine lettuce, spinach, kale & other leafy greens
- Asparagus, Brussels sprouts, broccoli & avocado
- Bananas & sweet potatoes
Hormones Feel Out of Whack?
If you’re dealing with PMS, mood swings, irregular cycles, or feeling like your hormones are all over the place, getting the right B vitamins may be part of the solution.
B6, B5, and folate play key roles in hormone production, metabolism, and detoxification. B5 supports adrenal hormones (like cortisol), while B6 helps balance estrogen and supports progesterone production.
When these nutrients are low, your body may struggle to process hormones properly.
When your hormones are out of what due to vitamin deficiency, you might experience, PMS, mood swings, irritability, sleep disturbances and have a lower tolerance for stress.
Stress also depletes B vitamins—so it can quickly become a vicious cycle.
B-Vitamin Food Sources for Hormone Balance:
- Grass-fed beef, lamb & venison
- Beef & Chicken liver
- Chicken (especially thighs)
- Wild caught salmon
- Pasture-raised egg yolks
- Avocado, Mushrooms
- Sweet potatoes & bananas
- Sunflower seeds
Constant Cravings or Blood Sugar Swings?
If you’re riding the blood sugar rollercoaster—crashing, craving sugar, and feeling shaky or irritable, time and time again—B vitamins may be a missing link.
B1 and biotin (B7) help your body properly process glucose, while B3 and B5 support overall metabolic function and stress response. B6 plays a role in reducing cravings by supporting serotonin production.
When B vitamins are low, your body struggles to efficiently use glucose for energy—so it keeps asking for more. You might experience hard to resist sugar cravings, energy crashes, feeling shaky between meals, and feeling irritable when hungry.
These symptoms are classic symptoms for high blood sugar as well and a need for sugar detoxification. In addition to making sure you get enough of these B vitamins, you might also check out the Ultimate Sugar Detox Cheat Sheet. It’s a free resource that I’ve created to help you eliminate sugar cravings and reduce blood sugar levels.
B-Vitamin Food Sources for Blood Sugar Balance Include:
- Pasture-raised egg yolks
- Grass-fed beef, lamb & other red meat
- Pork chops & ground pork
- Salmon, tuna & sardines
- Walnuts, almonds, sunflower seeds, macadamia nuts
- Acorn & butternuts squash
- Avocados
When Might You Need More Than Food?
While a real food diet including a variety of proteins, fruits, vegetables and healthy fats is the best foundation, some people may need additional support.
You may benefit from supplementation if you:
- Have persistent fatigue or brain fog
- Follow a vegetarian or vegan diet (especially for B12)
- Have digestive issues
- Are over 50
- Have an MTHFR gene mutation (reduces ability to utilize folate & B12)
- Have elevated homocysteine
In these cases, choosing active forms like Methyl B-12 and Methylfolate or a high quality B-Complex can make a big difference.
B Vitamins May Be Tiny, But They Are Mighty.
B vitamins help you turn food into energy, think clearly, balance hormones, protect your heart, and stabilize blood sugar. When they’re low, your body often sends signals—fatigue, cravings, mood swings, brain fog—that are easy to overlook or misinterpret.
Support your body with real, nutrient-dense foods first. And if something still feels off, B vitamins might be the missing piece that helps everything start to click.
