Ahem.
Let's see the reference.

(EDIT) Found one.
http://www.acc.org/latest-in-cardio...-n-oxide-in-acs

Interpretation: TMAO as some biomarker for CVD risk may have merit. What causes it to go up ?

----- Wikipedia ------
https://en.wikipedia.org/wiki/Trimethylamine_N-oxide

Microbiotic associations
The order Clostridiales, the genus Ruminococcus, and the taxon Lachnospiraceae are positively associated with TMA and TMAO levels.[8] In contrast, proportions of S24-7, an abundant family from Bacteroidetes, are inversely associated with TMA and TMAO levels.[8]

The concentration of TMAO in the blood increases after consuming foods containing carnitine[10] or lecithin[9] if the bacteria that convert those substances to TMAO are present in the gut.[11] High concentrations of carnitine are found in red meat, some energy drinks, and some dietary supplements; lecithin is found in soy, eggs,[11] as an ingredient in processed food and is sold as a dietary supplement.

The link between cardiovascular diseases and TMAO is disputed by other researchers.[13] Clouatre et al. argue that choline sources and dietary L-carnitine do not contribute to a significant elevation of blood TMAO, and the main TMAO source in the diet is fish.[14]

Another source of TMAO is dietary phosphatidylcholine, again by way of bacterial action in the gut. Phosphatidyl choline is present at high concentration in egg yolks and some meats.

Inhibition of TMAO
Vegan and vegetarian diets appear to select against gut flora that metabolize carnitine (in favor of other gut flora more coordinated with their food supply). This apparent difference in their microbiome is associated with substantially reduced gut bacteria capable of converting carnitine to trimethylamine, which is later metabolized in the liver to TMAO.[10]

3,3-Dimethyl-1-butanol (DMB), a structural analog of choline, inhibits microbial TMA formation in mice and in human feces, thereby reducing plasma TMAO levels after choline or carnitine supplementation.[8] It is found in some balsamic vinegars, red wines, and some cold-pressed extra virgin olive oils and grape seed oils.[8]

Summary: put some Olive oil based Chipotle Mayo on your Hamburger patty. (Personal opinion: I'm adding mustard, pickles, hot peppers, jalapenos, pepper as well).