High blood mostly high up to 306

by Dixon mnyika
(doko Drc(currently))





Original question from Dixon:


“My blood sugar is often high, sometimes up to 306 mg/dL. My diet includes cassava flour, wheat flour, beans, fish, and rice. For the last two months I have noticed a reduced sex drive and poorer sexual performance. What can I do to regain normal sexual function?”



Quick Answer: A blood glucose of 306 mg/dL (about 17.0 mmol/L) is very high and should not be managed by diet changes alone if it is happening repeatedly. High glucose can contribute to sexual problems by affecting blood vessels, nerves, energy, mood, and sometimes hormones, but low libido or poor sexual performance can also have other causes. I would arrange a medical review promptly rather than waiting another month. If glucose above 300 mg/dL occurs with vomiting, abdominal pain, deep or rapid breathing, significant dehydration, confusion, marked drowsiness, or ketones, seek urgent medical care.


Written by Dr. Albana Greca, MD, MMedSc



Hi Dixon,



Your first priority is the repeated glucose around 306 mg/dL. One high reading can occur for several reasons, but readings repeatedly near or above 300 suggest that your current diabetes plan needs review. Our guide to dangerously high blood sugar levels explains why symptoms, ketones, illness, and how long the glucose remains high are just as important as the number itself.



I would not wait a month to see whether this settles. Contact your diabetes clinician promptly and bring a record of your glucose readings, meal times, medicines, and any symptoms. If you use insulin, follow only the correction instructions already given by your diabetes team; do not guess an extra dose.



Can High Blood Sugar Affect Sexual Function?



Yes. Persistent hyperglycemia can damage blood vessels and nerves that are important for sexual function. Diabetes can also contribute to fatigue, low mood, reduced arousal, and hormonal problems. In men, this may show up as difficulty getting or maintaining an erection as well as reduced libido.



However, I would not assume diabetes is the only cause. Sexual problems can also be related to high blood pressure, abnormal cholesterol, kidney disease, low testosterone, smoking, alcohol, certain medicines, depression, anxiety, relationship stress, or other medical conditions.



If erection problems are part of what you mean by poorer performance, our page on diabetes and erectile dysfunction explains how circulation, nerves, hormones, and other health factors can interact. Sexual problems are also discussed among the long-term complications of diabetes.



What Should Be Checked?



Because the change has lasted for two months and your glucose is often very high, I would ask your clinician to review your diabetes treatment and cardiovascular risk rather than focusing only on sexual symptoms.




  • HbA1c to estimate your average glucose over the previous few months.

  • Kidney function and a review of your current diabetes medicines.

  • Blood pressure and cholesterol, because vascular health matters for both erections and heart health.

  • Medication review, since some medicines can affect sexual function.

  • Testosterone testing when clinically appropriate, especially if reduced libido is persistent or accompanied by other symptoms of low testosterone.



Your HbA1c result can help show whether the 300-range readings are isolated or part of a longer pattern.



How I Would Adjust the Diet



Cassava flour, wheat flour, and rice are all carbohydrate-containing

foods, and large portions can raise glucose substantially. I would not describe cassava or wheat flour as automatically “high-fiber,” because the fiber content depends on the product and how refined it is.



Beans are often useful because they provide carbohydrate together with fiber and protein, and fish is a good protein choice when it is grilled, baked, steamed, or otherwise prepared without excessive frying. Rather than banning all starches, I would work on portions and meal balance. Our guide to carbohydrates, glycemic index, and glycemic load explains why total carbohydrate, processing, fiber, and portion size all matter.



A practical starting point is to make about half the plate non-starchy vegetables, one quarter protein such as fish, eggs, chicken, tofu, or beans, and one quarter a carbohydrate food such as rice, cassava, or another starch in a measured portion. Our diabetes diet guide can help you build meals around foods that are available locally rather than relying on a rigid Western menu.



Can Sexual Function Improve?



It can improve, especially when high glucose and other contributing problems are treated, but I would not promise that glucose control alone will restore sexual function. The cause has to be identified.



If erectile dysfunction is confirmed, effective treatments are available. A clinician may consider medicines such as sildenafil or tadalafil when they are medically appropriate, but these drugs are not safe with nitrate medicines used for chest pain and should not be started without reviewing your cardiovascular health and other medicines.



Regular physical activity can support glucose control, circulation, mood, and cardiovascular health, but if glucose is very high and you are unwell or ketones are present, strenuous exercise is not appropriate.



What Should You Do When Glucose Is Above 300?



Repeat the reading correctly if it is unexpected, follow your prescribed high-glucose or sick-day plan, drink water if you can safely do so and are not on a fluid restriction, and contact your clinician if readings remain this high. During illness, or if you have type 1 diabetes, check ketones according to your diabetes plan.



Our guide to blood sugar between 250 and 400 mg/dL explains when very high readings can be monitored with your care plan and when they require urgent assessment.




Important Safety Note: Seek urgent medical care if glucose around or above 300 mg/dL is accompanied by vomiting, abdominal pain, deep or rapid breathing, severe weakness, significant dehydration, confusion, unusual drowsiness, or moderate/large ketones. Do not try to correct these symptoms with exercise or home remedies.



Doctor’s Note: Dixon, I would treat the repeated glucose around 306 mg/dL and the new sexual symptoms as two reasons to arrange a medical review now. Better glucose control may help, but I would also check circulation, blood pressure, cholesterol, kidney health, medicines, and hormones when appropriate. Sexual dysfunction is common in diabetes and often treatable, so please do not feel embarrassed to raise it directly with your clinician.


Educational safety note: This answer is for general education and does not replace diagnosis or individualized treatment. Do not change insulin, diabetes medicines, testosterone, or erectile-dysfunction medicines without medical guidance.



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Last reviewed: September 2026



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